The affairs of the world are no more than so much trickery, and a man who toils for money or honour or whatever else in deference to the wishes of others, rather than because his own desire or needs lead him to do so, will always be a fool.

Nature reacts not only to physical disease, but also to moral weakness; when the danger increases; she gives us greater courage

There is no trifling with nature; it is always true, grave, and severe; it is always in the light, and the faults and errors fall to our share. It defies incompetency, but reveals its secrets to the competent, the truthful, and the pure.

The world is full of contradiction.

Man... knows only when he is satisfied and when he suffers, and only his sufferings and his satisfactions instruct him concerning himself, teach him what to seek and what to avoid. For the rest, man is a confused creature; he knows not whence he comes or whither he goes, he knows little of the world, and above all, he knows little of himself.

Since I have heard often enough that everyone in the end has his own religion, nothing seemed more natural to me than to fashion my own.

It is better to be doing the most insignificant thing than to reckon even a half-hour insignificant.