Open-mindedness is considered to be a virtue. But, strictly speaking, it cannot occur. A new experience must be redacted into old categories. We cannot handle each event freshly in its own right. If we did so, of what use would past experience be?

It takes a major unhappiness, a prolonged and bitter experience, to drive us away from loyalties once formed. And sometimes no amount of punishment can make us repudiate our loyalty.

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

The scientist, by the very nature of his commitment, creates more and more questions, never fewer. Indeed the measure of our intellectual maturity, one philosopher suggests, is our capacity to feel less and less satisfied with our answers to better problems.

Each person is an idiom unto himself, an apparent violation of the syntax of the species.

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.'

We cannot know the young child's personality by studying his systems of interest, for his attention is as yet too labile, his reactions impulsive, and interests unformed. From adolescence onward, however, the surest clue to personality is the hierarchy of interests, including the loves and loyalties of adult life.