Drive a nail home and clinch it so faithfully that you can wake up in the night and think of your work with satisfaction -- a work at which you would not be ashamed to invoke the muse.
Source: In The Executives Quotation Book, ed. by James Charlton, 1993.
-- Henry David Thoreau, (Jul 12 1817-1862), US essayist, poet, naturalist; He is best known for his description of life at Walden Pond, Walden, 1854 and his essay Civil Disobedience, 1849.