Ignorance is the soil in which belief in miracles grows.

Every church that has a standard higher than human welfare is dangerous.

The first step is for man to cease to be the slave of man. The second, is to cease to be the slave of the monsters of his own creation, the ghosts and phantoms of the air.

Take from the church the miraculous, the supernatural, the incomprehensible, the unreasonable, the impossible, the unknowable, the absurd, and nothing but a vacuum remains.

Intellect, without heart, is infinitely cruel. . . . So that, after all, the real aristocracy must be that of goodness where the intellect is directed by the heart.

Happiness is not a reward - it is a consequence. Suffering is not a punishment - it is a result.

The history of intellectual progress is written in the lives of infidels.