Knowing means to penetrate through the surface, in order to arrive at the roots, and hence the causes; knowing means to "see" reality in its nakedness. Knowing does not mean to be in the possession of the truth; it means to penetrate the surface and to strive critically and actively in order to approach truth ever more closely.

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.

There is hardly any activity, any enterprise, which is started out with such tremendous hopes and expectations, and yet which fails so regularly, as love.

The human passions transform man from a mere thing into a hero, into a being that in spite of tremendous handicaps tries to make sense of life.

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

According to me [Sigmund ] Freud did not notice that the dream expresses the inner experiences in a symbolic form,resembling in that, poetry or other art forms.

We are all equal in the sense that no man must mean - must be - the means for the purposes of another man; but each individual is an end in itself.