Famous quotes containing the words virtue and/or system:
“There is a natural aristocracy among men. The grounds of this are virtue and talents.”
—Thomas Jefferson (1743–1826)
“Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.”
—Rudolf Carnap (1891–1970)