“Consider the famous syllogism “All men are mortal; Socrates is a man; therefore Socrates is mortal.” So far, so good. But just because all men are mortal, it does not follow that all mortals are men, and it certainly does… — Carol Tavris Copy Share Image
It must be granted that in every syllogism, considered as an argument to prove the conclusion, there is a petitio principii. When we say, All men are mortal Socrates is a man therefore Socrates is mortal; it is unanswerably urged… — John Stuart Mill Copy Share Image