The dog [in Pavlov's ...

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.
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 Gordon Allport

Quotes from the same author

The specific goals we set for ourselves are almost always subsidiary to our long range intentions. A good parent, a good neighbour, a good citizen, is not good because his specific goals are acceptable, but because his successive goals are ordered to a dependable and socially desirable set of values. (1947)
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 Gordon Allport
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.
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 Gordon Allport
The outlines of the needed psychology of becoming can be discovered by looking within ourselves; for it is knowledge of our own uniqueness that supplies the first, and probably the best, hints for acquiring orderly knowledge of others.
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 Gordon Allport
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.
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 Gordon Allport
Personality is a pattern of thoughts, feelings, and behaviors that define who we are.
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 Gordon Allport