Famous quotes containing the words requires and/or verification:
“A man cannot wheedle nor overawe his Genius. It requires to be conciliated by nobler conduct than the world demands or can appreciate.”
—Henry David Thoreau (1817–1862)
“A fact is a proposition of which the verification by an appeal to the primary sources of our knowledge or to experience is direct and simple. A theory, on the other hand, if true, has all the characteristics of a fact except that its verification is possible only by indirect, remote, and difficult means.”
—Chauncey Wright (1830–1875)