We think the purpose of a child is to grow up because it does grow up. But its purpose is to play, to enjoy itself, to be a child. If we merely look to the end of the process, the purpose of life is death

All religions have based morality on obedience, that is to say, on voluntary slavery. That is why they have always been more pernicious than any political organization. For the latter makes use of violence, the former - of the corruption of the will.

Science even more than the Gospel teaches us humility. She cannot look down on anything, she does not know what superiority means, she despises nothing, never lies for the sake of a pose, and conceals nothing out of coquetry. She stops before the facts as an investigator, sometimes as a physician, never as an executioner, and still less with hostility and irony.

Every man who has lived for fifty years has buried a whole world or even two; he has grown used to its disappearance and accustomed to the new scenery of another act: but suddenly the names and faces of a time long dead appear more and more often on his way, calling up series of shades and pictures kept somewhere, "just in case," in the endless catacombs of the memory, making him smile or sigh, and sometimes almost weep.

Human development is a form of chronological unfairness, since late-comers are able to profit by the labors of their predecessors without paying the same price.

Compassionate love may be strong. It sobs, it burns, then it wipes away its tears – and it does nothing.

To build a city where it is impossible to build a city is madness in itself, but to build there one of the most elegant and grandest of cities is the madness of genius.