I must say though that it is a wonderfully convincing thing to hear trade figures of this kind properly handled. "Sunshine Sketches of a Little Town" by Stephen Leacock

The inventor of the Syllogism had a definite practical purpose, to get at the simplest, most convincing, undeniable and irresistible way of putting admitted or self- evident propositions so that their implication should be apparent. "Logic, Inductive and Deductive" by William Minto

But the internal evidence is even more convincing. "The Value of Money" by Benjamin M. Anderson, Jr.