"Though my own life is filled with activity, letters encourage momentary escape into other lives, and I come back to my own with greater contentment."

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But weightier still are the contentment which comes from work well done, the sense of the value of science for its own sake, insatiable curiosity, and, above all, the pleasure of masterly performance and of the chase. These are the effective forces which move the scientist. The first condition for the progress of science is to bring them into play.

— Lawrence Joseph Henderson