Love means to commit oneself without guarantee, to give oneself completely in the hope that our love will produce love in the loved person. Love is an act of faith, and whoever is of little faith is also of little love.

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

We have faith in the potentialities of others, of ourselves, and of mankind because, and only to the degree to which, we have experienced the growth of our own potentialities, the reality of growth in ourselves, the strength of our own power of reason and love.

Giving is more joyous than receiving, not because it is a deprivation, but because in the act of giving lies the expression of my aliveness.

I think American man unconsciously hates his work very often, because he feels trapped by it... imprisoned by it... because he feels that he is spending most of his energy for something which has no meaning in itself.

Human history began as an act of disobedience, and it is not unlikely that it will be terminated by an act of obedience. At this point in history the capacity to doubt, to criticize and to disobey may be all that stands between a future for mankind and the end of civilization.

Having lost religious faith and the humanistic values bound up with it, he [man] concentrated on technical and material values and lost the capacity for deep emotional experiences, for the joy and sadness that accompany them.