"What then is, or can be called, a moral guide? The shortest possible answer is one word: Intelligence. We want the experience of mankind, the true history of the race. We want the history of intellectual development, of the growth of the ethical, of the idea of justice, of conscience, of charity, of self-denial. We want to know the paths and roads that have been traveled by the human mind. These facts in general, these histories in outline, the results reached, the conclusions formed, the principles evolved, taken together, would form the best conceivable moral guide. We cannot depend on what are called “inspired books,” or the religions of the world. These religions are based on the supernatural, and according to them we are under obligation to worship and obey some supernatural being, or beings. All these religions are inconsistent with intellectual liberty. They are the enemies of thought, of investigation, of mental honesty. They destroy the manliness of man. They promise eternal rewards for belief, for credulity, for what they call faith. This is not only absurd, but it is immoral."

“After all, of what use is it to search for a creator? The difficulty is not thus solved. You leave your creator as much in need of a creator as anything your creator is supposed to have created. The bottom of your stairs rests on nothing, and the top of your stairs leans upon nothing. You have reached no solution. The word “God” is simply born of our ignorance. We go as far as we can, and we say the rest of the way is “God.” We look as far as we can, and beyond the horizon, where there is nought so far as we know but blindness, we place our Deity. We see an infinitesimal segment of a circle, and we say the rest is “God.”

“I happened to be in the company of six or seven Baptist elders—how I ever got into such bad company, I don’t know,—and one of them asked what I thought about baptism. Well, I never thought much about it; did not know much about it; didn’t want to say anything, but they insisted upon it. I said, “Well, I’ll give you my opinion—with soap, baptism is a good thing.”

“Good-by, gentlemen! I am not asking to be Governor of Illinois … I have in my composition that which I have declared to the world as my views upon religion. My position I would not, under any circumstances, not even for my life, seem to renounce. I would rather refuse to be President of the United States than to do so. My religious belief is my own. It belongs to me, not to the State of Illinois. I would not smother one sentiment of my heart to be the Emperor of the round world.”

“Nothing could tempt me to do this man injustice, though I could hardly add to the injury he has done himself.”

“The hands that help are holier than the lips that pray.”

“Our ancestors in the ages that are gone really believed that by force you could convince a man. You cannot change the conclusion of the brain by force, but I will tell you what you can do by force, and what you have done by force. You can make hypocrites by the million.”