What light is to the eyes - what air is to the lungs - what love is to the heart, liberty is to the soul of man.

All of the Ten Commandments that are good were old; all that were new art foolish. If Jehovah had been civilized he would have left out the commandment about keeping the Sabbath, and in its place would have said: "Thou shalt not enslave thy fellow-men." He would have omitted the one about swearing, and said: "The man shall have but one wife, and the woman but one husband." He would have left out the one about graven images, and in its stead would have said: "Thou shalt not wage wars of extermination, and thou shalt not unsheathe the sword except in self-defence.

Most men are followers, and implicitly rely upon the judgment of others. They mistake solemnity for wisdom, and regard a grave countenance as the title page and Preface to a most learned volume. So they are easily imposed upon by forms, strange garments, and solemn ceremonies. And when the teaching of parents, the customs of neighbors, and the general tongue approve and justify a belief or creed, no matter how absurd, it is hard even for the strongest to hold the citadel of his soul. In each country, in defence of each religion, the same arguments would be urged.

I hate above all things a cross man. What right has he to murder the sunshine of a day? What right has he to assassinate the Joy of life? When you go home, you ought to go like a ray of light-so that it will, even in the night, burst out of the doors and windows and illuminate the darkness.

Our civilization is not Christian. It does not come from the skies. It is not a result of inspiration. It is the child of invention, of discovery, of applied knowledge - that is to say, of science. When man becomes great and grand enough to admit that all have equal rights; when thought is untrammeled; when worship shall consist in doing useful things; when religion means the discharge of obligations to our fellow-men, then, and not until then, will the world be civilized.

The more a man knows, the more willing he is to learn-the less a man knows, the more positive he is that he knows everything.

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.