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.
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.
It is not that we have class prejudice, but only that we find comfort and ease in our own class. And normally there are plenty of people of our own class, or race, or religion to play, live, and eat with, and to marry.
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.
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.
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