To argue with a man who has renounced his reason is like giving medicine to the dead

I am the inferior of any man whose rights I trample under foot. Men are not superior by reason of the accidents of race or color. They are superior who have the best heart--the best brain. The superior man ... stands erect by bending above the fallen. He rises by lifting others.

The notion that faith in Christ is to be rewarded by an eternity of bliss, while a dependence upon reason, observation, and experience merits everlasting pain, is too absurd for refutation, and can be relieved only by that unhappy mixture of insanity and ignorance called 'faith.'

Reason, observation, and experience; the holy trinity of science.

Every man is dishonest who lives upon the labor of others, no matter if he occupies a throne

Those who have loved God most, have loved man least