Man governs himself more by impulse than reason

All man's troubles come from not knowing how to sit still in one room.

When we do not know the truth of a thing, it is good that there should exist a common error which determines the mind of man, as, for example, the moon, to which is attributed the change of seasons, the progress of diseases, etc. For the chief malady of man is a restless curiosity about things which he cannot understand; and it is not so bad for him to be in error as to be curious to no purpose.

Justice is what is established; and thus all our established laws will necessarily be regarded as just without examination, since they are established.

We sail within a vast sphere, ever drifting in uncertainty, driven from end to end. When we think to attach ourselves to any pointand to fasten to it, it wavers and leaves us; and if we follow it, it eludes our grasp, slips past us, and vanishes for ever. Nothing stays for us.

You corrupt religion either in favour of your friends, or against your enemies.

It is certain that those who have the living faith in their hearts see at once that all existence is none other than the work of the God whom they adore. But for those in whom this light is extinguished, [if we were to show them our proofs of the existence of God] nothing is more calculated to arouse their contempt. . . .