“Experience has taught me, in fact, that no man should be pitied because, every day in his life, he faces a hard, stubborn problem, but rather that it is the man who has no problem to solve, no hardships to face, who is to be pitied.”
A demanding problem can give effort direction and exercise ability; Washington therefore treats a life without challenge as potentially more limiting than one requiring sustained problem-solving.
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My Larger Education, Chapter I, “Learning from Men and Things”; Project Gutenberg #73923. The sentence continues Washington’s argument that confronting difficult practical problems can develop strength and clarity rather than merely consume effort.