I no longer count as one of my merits that I always tell the truth as much as possible; it has become my metier.

I've been a fortunate man in life, nothing has come easily.

No one who, like me, conjures up the most evil of those half-tamed demons that inhabit the human breast, and seeks to wrestle with them, can expect to come through the struggle unscathed.

When one does not have what one wants, one must want what one has.

In the long run, nothing can withstand reason and experience, and the contradiction religion offers to both is palpable.

The different religions have never overlooked the part played by the sense of guilt in civilization. What is more, they come forward with a claim...to save mankind from this sense of guilt, which they call sin.

In the last analysis the entire field of psychology may reduce to biological electrochemistry.