Even if man's hunger and thirst and his sexual strivings are completely satisfied, 'he' is not satisfied. In contrast to the animal his most compelling problems are not solved then, they only begin. He strives for power or for love, or for destruction, he risks his life for religious, for political, for humanistic ideals, and these strivings are what constitutes and characterizes the peculiarity of human life.

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

The most important things we talk about on Sundays are things to which we pay very little attention.

Love is often nothing but a favorable exchange between two people who get the most of what they can expect, considering their value on the personality market.

In times of change, learners inherit the earth

Just as love for one individual which excludes the love for others is not love, love for one's country which is not part of one's love for humanity is not love, but idolatrous worship.

The kind of relatedness to the world may be noble or trivial, but even being related to the basest kind of pattern is immensely preferable to being alone.