The deterioration of a government begins almost always by the decay of its principles.

The object of war is victory; that of victory is conquest; and that of conquest preservation.

The state of slavery is in its own nature bad.

The success of most things depends upon knowing how long it will take to succeed.

There are three species of government: republican, monarchical, and despotic.

Weak minds exaggerate too much the wrong done to the Africans.

When the body of the people is possessed of the supreme power, it is called a democracy.

Although born in a prosperous realm, we did not believe that its boundaries should limit our knowledge, and that the lore of the East should alone enlighten us.

If I knew of something that could serve my nation but would ruin another, I would not propose it to my prince, for I am first a man and only then a Frenchman... because I am necessarily a man, and only accidentally am I French.

In bodies moved, the motion is received, increased, diminished, or lost, according to the relations of the quantity of matter and velocity; each diversity is uniformity, each change is constancy.

The law of nations is naturally founded on this principle, that different nations ought in time of peace to do one another all the good they can, and in time of war as little injury as possible, without prejudicing their real interests.

There are only two cases in which war is just: first, in order to resist the aggression of an enemy, and second, in order to help an ally who has been attacked.

Thus the creation, which seems an arbitrary act, supposes laws as invariable as those of the fatality of the Atheists. It would be absurd to say that the Creator might govern the world without those rules, since without them it could not subsist.

When the legislative and executive powers are united in the same person, or in the same body of magistrates, there can be no liberty; because apprehensions may arise, lest the same monarch or senate should enact tyrannical laws, to execute them in a tyrannical manner.

There is no greater tyranny than that which is perpetrated under the shield of the law and in the name of justice.

Not to be loved is a misfortune, but it is an insult to be loved no longer.

Religious wars are not caused by the fact that there is more than one religion, but by the spirit of intolerance... the spread of which can only be regarded as the total eclipse of human reason.

But constant experience shows us that every man invested with power is apt to abuse it, and to carry his authority as far as it will go.

There is only one thing that can form a bond between men, and that is gratitude... we cannot give someone else greater power over us than we have ourselves.

Society is the union of men and not the men themselves.