The dog [in Pavlov's experiments] does not continue to salivate whenever it hears a bell unless sometimes at least an edible offering accompanies the bell. But there are innumerable instances in human life where a single association, never reinforced, results in the establishment of a life-long dynamic system. An experience associated only once with a bereavement, an accident, or a battle, may become the center of a permanent phobia or complex, not in the least dependent on a recurrence of the original shock.

Thwarted lives have the most character-conditioned hate

Love received and love given comprise the best form of therapy.

Reason adapts impulses and beliefs into the real world; rationalization, on the other hand, adapts the concept of reality to the impulses and beliefs of the individual. Reasoning discovers the true cause of our acts, rationalization finds good reasons for justifying our acts.

People who are aware of, and ashamed of, their prejudices are well on the road to eliminating them.

Since we think about ourselves so much of the time, it is comforting to assume ... that we really know the score.... [But] this is not an easy assignment. [As] Santayana wrote, 'Nothing requires a rarer intellectual heroism than willingness to see one's equation written out.'

If there is a purpose in life at all, there must be a purpose in suffering and in dying. But no man can tell another what this purpose is. Each must find out for himself, and must accept the responsibility that his answer prescribes. If he succeeds he will continue to grow in spite of all indignities.