Neither in my private life nor in my writings, have I ever made a secret of being an out-and-out unbeliever.

The impression forces itself upon one that men measure by false standards, that everyone seeks power, success, riches for himself, and admires others who attain them, while undervaluing the truly precious thing in life.

A strong egoism is a protection.

Look into the depths of your own soul and learn first to know yourself, then you will understand why this illness was bound to come upon you and perhaps you will thenceforth avoid falling ill.

It is a predisposition of human nature to consider an unpleasant idea untrue, and then it is easy to find arguments against it.

These patients have turned away from outer reality; it is for this reason that they are more aware than we of inner reality and can reveal to us things which without them would remain impenetrable.

These [religious ideas] are given out as teachings, are not precipitates of experience or end-results of thinking: they are illusions, fullfilments of the oldest, strongest and most urgent wishes of mankind.