Mental slavery is mental death, and every man who has given up his intellectual freedom is the living coffin of his dead soul.

Superstition is, always has been, and forever will be, the foe of progress, the enemy of education and the assassin of freedom.

No man of sense in the whole world believes in devils any more than he does in mermaids, vampires, gorgons, hydras, naiads, dryads, nymphs, fairies, the Fountain of Youth, [or] the Philosopher's Stone. . . .

The hands that help are better far / Than lips that pray. / Love is the ever gleaming star / That leads the way, / That shines, not on vague worlds of bliss, / But on a paradise in this.

Hope is the only universal liar who never loses his reputation for veracity.

I want no heaven for which I must give my reason; no happiness in exchange for my liberty, and no immortality that demands the surrender of my individuality. Better rot in the windowless tomb, to which there is no door but the red mouth of the pallid worm, than to wear the jeweled collar of a god.

When I became convinced that the universe is natural, that all the ghosts and gods are myths, there entered into my brain, into my soul, into every drop of my blood the sense, the feeling, the joy of freedom. The walls of my prison crumbled and fell. The dungeon was flooded with light and all the bolts and bars and manacles became dust.