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 by the adversaries of the syllogistic theory, that the proposition, Socrates is mortal.

It is questionable if all the mechanical inventions yet made have lightened the day's toil of any human being.

The amount of eccentricity in a society has generally been proportional to the amount of genius, mental vigor, and moral courage it contained. That so few now dare to be eccentric marks the chief danger of the time.

Men do not desire to be rich, but to be richer than other men.

The strongest of all arguments against the interference of the public with purely personal conduct, is that when it does interfere, the odds are that it interferes wrongly, and in the wrong place.

Liberty consists in doing what one desires.

The peculiarity of the evidence of mathematical truths is that all the argument is on one side.