It is not enough that our life is an easy one. We must live on the stretch, retiring to our rest like soldiers on the eve of a battle, looking forward to the strenuous sortie of the morrow.
(Henry David Thoreau (1817-1862), U.S. philosopher, author, naturalist. "The Service: Qualities of the Recruit" (1840), in The Writings of Henry David Thoreau, vol. 4, p. 279, Houghton Mifflin (1906).)
A farmer, a hunter, a soldier, a reporter, even a philosopher, may be daunted; but nothing can deter a poet, for he is actuated by pure love. Who can predict his comings and goings? His business calls him out at all hours, even when doctors sleep.
(Henry David Thoreau (1817-1862), U.S. philosopher, author, naturalist. "Winter Visitors," Walden (1854).)