“There is only one virtue, justice; only one duty, to be happy; only one corollary, not to overvalue life and not to fear death.”

Anyone who takes it upon himself, on his private authority, to break a bad law, thereby authorizes everyone else to break the good ones.

Only passions, great passions, can elevate the soul to great things.

I am wholly yours – you are everything to me; we will sustain each other in all the ills of life it may please fate to inflict upon us; you will soothe my troubles; I will comfort you in yours.

Justice is the first virtue of those who command, and stops the complaints of those who obey.

Scepticism is the first step toward truth.

Are we not madder than those first inhabitants of the plain of Sennar? We know that the distance separating the earth from the sky is infinite, and yet we do not stop building our tower.

I discuss with myself questions of politics, love, taste, or philosophy. I let my mind rove wantonly, give it free rein to followany idea, wise or mad that may present itself. My ideas are my harlots.

When one compares the talents one has with those of a Leibniz , one is tempted to throw away one’s books and go die quietly in the dark of some forgotten corner.

In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go.

In general, children, like men, and men, like children, prefer entertainment to education.

To describe women, the pen should be dipped in the humid colors of the rainbow, and the paper dried with the dust gathered from the wings of a butterfly.

Although a man may wear fine clothing, if he lives peacefully; and is good, self-possessed, has faith and is pure; and if he does not hurt any living being, he is a holy man.

Only a very bad theologian would confuse the certainty that follows revelation with the truths that are revealed. They are entirely different things.

If you want me to believe in God, you must make me touch him.

All abstract sciences are nothing but the study of relations between signs.

No man has received from nature the right to give orders to others. Freedom is a gift from heaven, and every individual of the same species has the right to enjoy it as soon as he is in enjoyment of his reason.