Proposition True

Famous quotes containing the words proposition and/or true:

“Whenever a man acts purposively, he acts under a belief in some experimental phenomenon. Consequently, the sum of the experimental phenomena that a proposition implies makes up its entire bearing upon human conduct.”
—Charles Sanders Peirce (1839–1914)

“Consider the deference which is everywhere paid to a doctor’s opinion. Nothing more strikingly betrays the credulity of mankind than medicine. Quackery is a thing universal, and universally successful. In this case it becomes literally true that no imposition is too great for the credulity of men.”
—Henry David Thoreau (1817–1862)