... we have broken down the self-respecting spirit of man with nursery tales and priestly threats, and we dare to assert, that inproportion as we have prostrated our understanding and degraded our nature, we have exhibited virtue, wisdom, and happiness, in our words, our actions, and our lives!

... the happiness of a people is the only rational object of government, and the only object for which a people, free to choose, can have a government at all.

All that I say is, examine, inquire. Look into the nature of things. Search out the grounds of your opinions, the for and against. Know why you believe, understand what you believe, and possess a reason for the faith that is in you.

... the yearly expenses of the existing religious systemexceed in these United States twenty millions of dollars. Twenty millions! For teaching what? Things unseen and causes unknown!... Twenty millions would more than suffice to make us wise; and alas! do they not more than suffice to make us foolish?

The best road to correct reasoning is by physical science; the way to trace effects to causes is through physical science; the only corrective, therefore, of superstition is physical science.

the mode of delivering a truth makes, for the most part, as much impression on the mind of the listener as the truth itself.

We are on the earth, and they tell us of heaven; we are human beings, and they tell us of angels and devils; we are matter, and they tell us of spirit; we have five senses whereby to admit truths, and a reasoning faculty by which to build our belief upon them; and they tell us of dreams dreamed thousands of years ago, which our experience flatly contradicts.