Nothing could be more idiotic and absurd than the doctrine of the trinity.

The object of all education should be to increase the usefulness of man - usefulness to himself and others.

[T]he blossom of benevolence, of charity, is the fairest flower, no matter whether it blooms by the side of a hovel, or bursts from a vine climbing the marble pillar of a palace. I respect no man because he is rich; I hold in contempt no man because he is poor.

I am going to put the Bible out of business.

Nothing but truth is immortal.

Many people think they have religion when they are troubled with dyspepsia.

All should be taught that the highest ambition is to be happy, and to add to the well-being of others; that place and power are not necessary to success; that the desire to acquire great wealth is a kind of insanity. They should be taught that it is a waste of energy, a waste of thought, a waste of life, to acquire what you do not need and what you do not really use for the benefit of yourself or others.