Rollo May (April 21, 1909, Ada, Ohio - October 22, 1994, Tiburon, California) was the best known American existential psychologist, authoring the influential book Love and Will in 1969..
"The acorn becomes an oak by means of automatic growth; no commitment is necessary. The kitten similarly becomes a cat on the basis of instinct. Nature and being are identical in creatures like them. But a man or woman becomes fully human only by his or her choices and his or her commitment to them. People attain worth and dignity by the multitude of decisions they make from day by day. These decisions require courage."
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