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

Millions of men give all their energies, as well as their very souls, for the acquisition of gold. And this will continue as long as society is ignorant enough and hypocritical enough to hold in high esteem the man of wealth without the slightest regard to the character of the man.

I believe in the religion of reason -- the gospel of this world; in the development of the mind, in the accumulation of intellectual wealth, to the end that man may free himself from superstitious fear, to the end that he may take advantage of the forces of nature to feed and clothe the world.

As long as a man lives he should study. Death alone has the right to dismiss the school.

If the world ever advances beyond what it is today, it must be led by men who express their real opinions.

Ignorance worships mystery; reason explains it; the one grovels, the other soars.

Tell me there is a God in the serene heavens that will damn his children for the expression of an honest belief! More men have died in their sins, judged by your orthodox creeds, than there are leaves in all the forests in the wide world ten thousand times over. Tell me these men are in Hell; that these men are in torment; that these children are in eternal pain, and that they are to be punished forever and forever! I denounce this doctrine as the most infamous of lies.