
“"Genius" (which means transcendent capacity of taking trouble, first of all).”
Life of Fredrick the Great http://www.cs.cmu.edu/~spok/metabook/fgreat.html, Bk. IV, ch. 3 (1858–1865). Sometimes misreported as "Genius is an infinite capacity for taking pains"; see Paul F. Boller, Jr., and John George, They Never Said It: A Book of Fake Quotes, Misquotes, & Misleading Attributions (1989), p. 12.
1860s