However unwillingly a person who has a strong opinion may admit the possibility that his opinion may be false, he ought to be moved by the consideration that, however true it may be, if it is not fully, frequently, and fearlessly discussed, it will be held as a dead dogma, not a living truth.

Is there any moral enormity which might not be justified by imitation of such a Deity?

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.

Induction is a process of inference; it proceeds from the known to the unknown.

A person's taste is as much his own peculiar concern as his opinion or his purse.

The real advantage which truth has, consists in this, that when an opinion is true, it may be extinguished once, twice, or many times, but in the course of ages there will generally be found persons to rediscover it

Among the works of man, which human life is rightly employed in perfecting, the first in importance surely is man himself.