Regarded anatomically, the resemblances between the foot of Man and the foot of the Gorilla are far more striking and important than the differences... be the differences between the hand and foot of Man and those of the Gorilla what they may the differences between those of the Gorilla and those of the lower Apes are much greater.

Proclaim human equality as loudly as you like, Witless will serve his brother.

If a man cannot do brain work without stimulants of any kind, he had better turn to hand work it is an indication on Nature's part that she did not mean him to be a head worker.

There is nothing of permanent value (putting aside a few human affections) nothing that satisfies quiet reflection--except the sense of having worked according to one's capacity and light to make things clear and get rid of cant and shams of all sorts.

Follow humbly wherever and to whatever abyss Nature leads, or you shall learn nothing.

The dogma of the infallibility of the Bible is no more self-evident than is that of the infallibility of the popes.

It is not who is right, but what is right, that is of importance.