A mere life of ease is not in the end a very satisfactory life, and, above all, it is a life which ultimately unfits those who follow it for serious work in the world. In the last analysis a healthy state can exist only when the men and women who make it up lead clean, vigorous, healthy lives; when the children are so trained that they shall endeavor, not to shirk difficulties, but to overcome them; not to seek ease, but to know how to wrest triumph from toil and risk.

The Strenuous Life: Essays and Addresses (1900) - The Strenous Life