Stupidity is much the same all the world over

The moment one asks himself whether he is happy, he ceases to be so.

In this age, the man who dares to think for himself and to act independently does a service to his race.

But these few are the salt of the earth; without them, human life would become a stagnant pool. Not only is it they who introduce good things which did not before exist, it is they who keep the life in those which already existed.

The beliefs which we have most warrant for, have no safeguard to rest on, but a standing invitation to the whole world to prove them unfounded.

The liberty of the individual must be thus far limited; he must not make himself a nuisance to other people.

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.