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

If the meaning of life has become doubtful, if one's relations to others and to oneself do not offer security, then fame is one means to silence one's doubts. It has a function to be compared with that of the Egyptian pyramids or the Christian faith in immortality: it elevates one's individual life from its limitations and instability to the plane of indestructability; if one's name is known to one's contemporaries and if one can hope that it will last for centuries, then one's life has meaning and significance by this very reflection of it in the judgments of others.

Happiness is a very proud word of our whole cultural heritage.

To spare oneself from grief at all cost can be achieved only at the price of total detachment, which excludes the ability to experience happiness

The ordinary man with extraordinary power is the chief danger for mankind - not the fiend or the sadist.

To have faith requires courage, the ability to take a risk, the readiness even to accept pain and disappointment. Whoever insists on safety and security as primary conditions of life cannot have faith; whoever shuts himself off in a system of defense, where distance and possession are his means of security, makes himself a prisoner. To be loved, and to love, need courage, the courage to judge certain values as of ultimate concern – and to take the jump and to stake everything on these values.

The danger of the past was that men became slaves. The danger of the future is that men may become robots. True enough, robots do not rebel. But given man's nature, robots cannot live and remain sane, they become ''Golems',' they will destroy their world and themselves because they cannot stand any longer the boredom of a meaningless life.