The secret of life is then that this fine youthful spirit should never be lost. Out of the turbulence of youth should come this fine precipitate—a sane, strong, aggressive spirit of daring and doing. It must be a flexible, growing spirit, with a hospitality to new ideas, and a keen insight into experience. To keep one's reactions warm and true, is to have found the secret of perpetual youth, and perpetual youth is salvation.

Page 441. Quote republished in "Left and Right: The Prospects for Liberty," Left and Right: A Journal of Libertarian Thought 1, no. 1 (Spring, 1965), p. 22. - "Youth" (1912) - III