The criterion of mental health is not one of individual adjustment to a given social order, but a universal one, valid for all men, of giving a satisfactory answer to the problem of human existence.

Selfish persons are incapable of loving others, but they are not capable of loving themselves either.

Mother's love is peace. It need not be acquired, it need not be deserved.

Free man is by necessity insecure, thinking man by necessity uncertain.

The danger of the past was that men became slaves. The danger of the future is that man may become robots.

For [Karl] Marx what counts is man. He is the root of everything;while for capitalism, the aim are things, profit, and man is only a means to gain them. As an authentically religious individual, Marx could not be other than against "religion".

Man is the only animal for whom his own existence is a problem which he has to solve.