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.

It seems to me that you are solving a problem which goes beyond the limits of physiology in too simple a way. Physiology has realized its problem with fortitude, breaking man down into endless actions and counteractions and reducing him to a crossing, a vortex of reflex acts. Let it now permit sociology to restore him as a whole. Sociology will wrest man from the anatomical theatre and return him to history.

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.

You can no more bridle passions with logic than you can justify them in the law courts. Passions are facts and not dogmas.

I believe what I write to be the truth...every man who is not indifferent to the truth has a weakness for spreading it about.

People who have realized that this is a dream imagine that it is easy to wake up, and are angry with those who continue sleeping, not considering that the whole world that environs them does not permit them to wake. Life proceeds as a series of optical illusions, artificial needs and imaginary sensations.

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