The
Rational Basis of
International Law
by Hugo Grotius
The civil law, both that of Rome and that of
each nation in particular, has been treated of by
many, with a view either to elucidate it, through
commentaries, or to present it in a compendious
form. But that law which regards the relations
between peoples, or between rulers of peoples,
whether it proceed from nature or be instituted by
divine commands or introduced by custom and tacit
agreement, has been touched on by few, and has by
no one been treated as a whole and in an orderly
manner. And yet that this be done is of concern to
the human race.
And such a work is the more necessary because of
the fact that persons in our time, as well as in
former ages, have held in contempt what has been
done in this province of jurisprudence, as if no
such thing existed, as a mere name. Every one is
familiar with the saying of Euphemiys in
Thucydides, that for a king or city who has
authority to maintain, nothing is unjust which is
useful; and to the same effect is the saying that
with good fortune equity is where strength is, and
that the commonwealth cannot be administered
without doing some wrong. To this we add that the
controversies which arise between peoples and
between kings commonly have war as their arbiter.
But that war has nothing to do with laws is not
only the opinion of the ignorant; even wise and
learned men often let fall expressions which
support such an opinion. For nothing is more common
than to place laws and arms in opposition to each
other. . . .
Since our discussion of law is undertaken in
vain if there is no law, it will serve both to
commend and fortify our work if we refute briefly
this very grave error. And that we may not have to
deal with a mob of opponents, let us appoint an
advocate to speak for them. And whom can we select
fitter than Carneades, who had arrived at the point
-- the supreme aim of his academic philosophy --
where he could use the strength of his eloquence
for falsehood as easily as for truth? When he
undertook to argue against justice -- especially,
the justice of which we here treat, he found no
argument stronger than this: that men had, as
utility prompted, established laws, differing among
different peoples as manners differed, and, among
the same people, often changing with the change of
times; but that there is no natural law, since all
men, as well as other animals, are impelled by
nature to seek their own advantage; and that either
there is no justice, or if it exist, it is the
highest folly since through it one harms oneself in
consulting the interests of others.
But what this philosopher says, and, following
him, the poet -- Nature cannot distinguish the just
from the unjust," must by no means be admitted. For
though man is indeed an animal, he is an uncommon
animal, differing much more from all other animals
than they differ from one another; this is
evidenced in many actions peculiar to the human
species. Among the attributes peculiar to man is
the desire for society -- that is for communion
with his fellowmen, and not for communion simply,
but for a tranquil association and one suited to
the quality of his intellect; this the Stoics
called Oykeiosin. Therefore, the statement
that by nature every animal is impelled to seek
only its own advantage cannot be conceded in this
general for even in other animals their desires for
their own good are tempered by regard for their
offspring and for others of their species; this we
believe to proceed from some intelligence outside
of themselves; for with regard to other acts not at
all more difficult than these an equal degree of
intelligence does not appear. The same is to be
said of infants, in whom, previous to all teaching,
there is manifested a certain disposition to do
good to others, as is sagaciously remarked by
Plutarch; for example, at that age compassion
breaks forth spontaneously. A man of full age knows
how to act similarly in similar cases, and he has
exceptional craving for society, whose peculiar
instrument, language, he alone among all animals
possesses; accordingly, he has the faculty of
knowing and acting according to general principles;
the tendencies which agree with this faculty do not
belong to all animals, but are the peculiar
properties of human nature.
This concern for society, which we have now
stated in a rude manner, and which is in agreement
with the nature of the human intellect, is the
source of law, properly so called, of which we are
speaking. It is law that determines the abstention
from another's property; the restitution of
another's goods which we have in our possession and
of any gain we have derived from such possession;
the obligation to fulfill promises; the reparation
for damage wrongfully done; and the retribution of
punishments.
From this signification of law there has flowed
another larger meaning. For man is superior to
other animals not only in the social impulse, of
which we have spoken, but also in his judgment in
estimating what is pleasant and what is injurious
-- not only for the present but for the future
also, and the things which may lead to good or to
ill. We know, therefore, that, in accordance with
the quality of the human intellect, it is congruous
to human nature to follow, in such matters, a
judgment rightly formed and not to be misled by
fear or by the enticement of present pleasure, or
to be carried away by heedless impulse; and that
what is plainly repugnant to such judgment is
likewise contrary to natural law, that is, to
natural human law.
And here comes the question of a wise assignment
in bestowing upon each individual and each body of
men the things which peculiarly belong to them;
this disposition will sometimes prefer the wiser
man to the less wise, the neighbor to a stranger,
the poor man to the rich man, according as the
nature of each act and each matter requires. This
question some have made a part of law, strictly and
properly so called; though law, properly speaking,
has a very different nature; for it consists in
this -- that each should leave to another what is
his and give to him what is his due.
What we have said would still be in point even
if we should grant, what we cannot without great
wickedness, that there is no God, or that He
bestows no regard upon human affairs. Since we are
assured of the contrary, partly by our reason and
partly by constant tradition, confirmed by many
arguments and by miracles attested by all ages, it
follows that God, as our creator to whom we owe our
being and all that we have, is to be obeyed by us
without exception, especially since He has in many
ways shown himself to be supremely good and
supremely powerful. Wherefore, He is able to bestow
upon those who obey Him the highest rewards, even
eternal rewards, since He himself is eternal; and
He must be believed to be willing to do this,
particularly if He has promised to do so in plain
words; and this we as Christians believe, convinced
by the indubitable faith of testimonies.
And here we find another origin of law, besides
that natural source of which we have spoken; it is
the free will of God, to which our reason
indisputably tells us we must submit ourselves. But
even natural law -- whether it be the natural
social law, or law in the looser meaning of which
we have spoken -- may yet be rightfully ascribed to
God, though it proceed from the principles of man's
inner nature; for it was in accordance with His
will that such principles came to exist within us.
In this sense Chrysippus and the Stoics said that
the origin of law was not to be sought in any other
source than Jove himself; and it may be conjectured
that the Latins took the word jus from the
name Jove.
It may be added that God has made these
principles more manifest by the commandments which
He has given in order that they might be understood
by those whose minds have weaker powers of
reasoning. And He has controlled the aberrations of
our impulses, which drive us this way and that, to
the injury of ourselves and of others; bridling our
more vehement passions, and restraining them within
due limits.
In the next place, since it is conformable to
natural law to observe compacts (for some mode of
obliging themselves was necessary among men, and no
other natural mode can be imagined) civil rights
were derived from that very source. For those who
joined any community, or put themselves in
subjection to any man or men, either expressly
promised or from the nature of the case must have
been understood to promise tacitly, that they would
conform to that which either the majority of the
community, or those whom power was assigned, should
determine.
And therefore what Carneades said, and what has
been said by others -- that utility is the mother
of justice and right -- is, if we are to speak
accurately, not true. For the mother of natural law
is human nature itself, which would lead us to
desire mutual society even though we were driven
thereto by other wants. The mother of civil law is
obligation by compact; and since compacts derive
their force from natural law, nature may be said to
be the great-grandmother of civil law. But utility
supplements (accedit) natural law. For the
Author of nature ordained that we, as individuals,
should be weak and in need of many things for
living well, in order that we might be the more
impelled to cherish society. But utility furnished
the occasion for civil law; for that association or
subjection of which we have spoken, was at the
first instituted for the sake of some utility.
Accordingly, those who prescribe for others
ordinarily design, or should design, some utility
in their laws.
But just as the laws of each state regard the
utility of that state, so also between all states,
or, at least, between most of them, certain laws
could be established by consent -- and it appears
that laws have been established -- which regard the
utility, not of particular communities but of the
great aggregate of communities. And this is what is
called the law of nations (jus gentium), in
so far as we distinguish it from natural law. This
part of law is omitted by Carneades, who divides
all law into natural law and the civil law of
particular peoples; although as he was about to
treat of that law which obtains between one people
and another (for he subjoins a discussion upon war
and acquisitions by war), he was especially called
upon to make mention of law of this kind.
Moreover, Carneades improperly traduces justice
when he calls it folly. For since, as he himself
acknowledges, the citizen is not foolish who in a
state obeys the civil law, although in consequence
of such respect for the law he may lose some things
which are useful to him, so too a people is not to
be deemed foolish which does not estimate its
interests so highly as to disregard the common laws
between peoples for the sake of its own advantage.
The reason is the same m both cases. For as a
citizen who disobeys the civil law for the sake of
present utility destroys that in which the
perpetual utility of himself and his posterity is
bound up, so too a people which violates the laws
of nature and of nations breaks down the bulwark of
its own tranquillity for future time. Even though
no utility were to be looked on from the
observation of law, such a course would be one not
of folly but of wisdom, to which we feel ourselves
drawn by nature.
Wherefore, that saying that we were compelled to
establish laws from fear of wrong, is not
universally true; this opinion is explained by a
speaker in Plato's dialogues, who says that laws
were introduced because of the fear of receiving
wrong, and that men are driven to respect justice
by a certain compulsion. But this applies only to
those institutions and statutes which were devised
for the more easy enforcement of law; as when many,
individually weak, fearing oppression by those who
were stronger, combined to establish judicial
authorities and to protect them by their common
strength, so that those whom they could not resist
singly, they might, united, control. Only in this
sense may we properly accept the statement that law
is that which pleases the stronger party: namely,
that we are to understand that law does not attain
its external end unless it has force as its
servant. Thus Solon accomplished great things, as
he himself said, by linking together force and
law.
But even law that is unsupported by force is not
destitute of all effect; for justice brings
serenity to the conscience, while injustice brings
torments and remorse such as Plato describes as
afflicting the hearts of tyrants. The common
feeling of upright men approves justice and
condemns injustice. The important point is that
justice has for its friend, God, while injustice
has Him as an enemy; He reserves his judgments for
another life, yet in such manner that He often
exhibits their power in this life; we have many
examples of this in history.
The error which many commit who, while they
require justice in citizens, hold it to be
superfluous in a people or the ruler of a people,
is caused primarily by this fact: they are
regarding only the utility which arises from the
law. This utility is evident in the case of
citizens, who individually are too weak to secure
their own protection. Great states, on the other
hand, which seem to embrace within themselves all
that is necessary to support life, do not appear to
have need of that virtue which regards extraneous
parties and is called justice.
But -- not to repeat what I have already said,
that law is not established for the sake of utility
alone -- there is no state so strong that it may
not at some time need the aid of others external to
itself, either in the way of commerce or in order
to repel the force of many nations combined against
it. Hence we see that alliances are sought even by
the most powerful peoples and kings; the force of
such alliances is entirely destroyed by those who
confine law within the boundaries of a state. It is
most true that everything becomes uncertain if we
withdraw from law.
Since, for the reasons which I have stated, I
hold it to be completely proved that there is
between nations a common law which is of force with
respect to war and in war, I have had many and
grave reasons why I should write a work on that
subject. For I saw prevailing throughout the
Christian world a license in making war of which
even barbarous nations would have been ashamed,
recourse being had to arms for slight reasons or
for no reason; and when arms were once taken up,
all reverence for divine and human law was lost,
just as men were henceforth authorized to commit
all crimes without restraint.
It remains now that I briefly explain with what
aids and with what care I have undertaken this
work. In the first place, it was my object to refer
to the truth of the things which belong to natural
law to certain notions so certain that no one can
deny them without doing violence to his own nature.
For the principles of that law, if you attend to
them rightly, are of themselves patent and evident
almost in the same way as things which we perceive
by our external senses; for these do not deceive
us, if the organs are rightly disposed and other
necessary things are not wanting.
For the demonstration of natural law I have used
the testimonies of philosophers, historians, poets,
and finally orators. Not that these are to be
trusted indiscriminately; for they are ordinarily
writing to serve their sect, their argument, or
their cause. But when many, writing in different
times and places, affirm the same thing as true,
their unanimity must be referred to some universal
cause, which, in the questions with which we are
here concerned, can be no other than either a right
deduction proceeding from principles of nature, or
some common agreement. The former cause points to
the law of nature, the latter to the law of
nations; the difference between these two is to be
discerned not in the testimonies themselves (for
writers everywhere confound the law of nature and
the law of nations), but in the quality of the
matter. For what can not be deduced from certain
principles by unerring reasoning, and yet is seen
to be observed everywhere, must have its origin in
free consent.
Passages of history have a twofold use in our
argument: they supply both examples and judgments.
In proportion as examples belong to better times
and better nations, they have greater authority; we
have therefore preferred the examples from ancient
Greece and Rome. Nor are judgments to be despised,
especially when many of them agree; for natural law
is, as we have said, to be proved by such concord;
and the law of nations can be proved in no other
manner.
The opinions of poets and orators have not so
much weight; and these we often use not so much to
gain confirmation from them as to give to what we
are trying to say some ornamentation from their
modes of expression.
The books written by men inspired by God, or
approved by them, I often use as authority, with a
distinction between the Old and the New Testament.

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