As long as every question is answered by the word "God," scientific inquiry is simply impossible.

All religions are inconsistent with mental freedom. Shakespeare is my bible, Burns my hymn-book.

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 believed only by that unhappy mixture of insanity and ignorance, called faith.

Religion has not civilized man, man has civilized religion.

The man who does not do his own thinking is a slave, and is a traitor to himself and to his fellow-men.

For the most part we inherit our opinions. We are the heirs of habits and mental customs. Our beliefs, like the fashion of our garments, depend on where we were born. We are molded and fashioned by our surroundings.

We are not accountable for the sins of "Adam".