Winter is the time for study, you know, and the colder it is the more studious we are.
ATTRIBUTION:
Henry David Thoreau (18171862), U.S. philosopher, author, naturalist. Letter, October 24, 1847, to Sophia Thoreau, in The Writings of Henry David Thoreau, vol. 6, p. 134, Houghton Mifflin (1906).