When a person has swum, ...

When a person has swum, traveled, run a lathe, planted flowers, ridden a motorcycle, made wine, painted a picture, parachuted, he has increased the fund from which he may draw for new figural developments. In other words, as the background of his experience becomes more diversified, it also becomes potentially more harmonious with a whole range of happenings.
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 Erving Polster

Quotes from the same author

A new question for the psychotherapist to ask is whether a theory can go beyond mere effectiveness in achieving either a so-called cure or even personal growth into its implications for the nature of an evolving society.
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 Erving Polster
Theory and knowledge remain suspect, not because of inherent worthlessness, but because of their historic isolation from action. Without theoretical orientation, however, action is vulnerable to oversimplified and glib imitativeness-even mimicry-and to the use of the gimmick.
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 Erving Polster