If one is not productive in other spheres, one is not productive in the love either.

The average American never loses his sleep about affairs which relate to his society and to our whole country.

Most people see the problem of love primarily as that of being loved, rather than that of loving, of one's capacity to love. Hence the problem to them is how to be loved, how to be lovable.

Mobilizing the love of life is the only force that can defeat the love for the dead.

A new question has arisen in modern man's mind, the question, namely, whether life is worth living...No sensible answer can be given to the question...because the question does not make any sense.

Man can only know the nagation, never the position of ultimate reality.

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.