All religions are both harmful and untrue.

If a man is offered a fact which goes against his instincts, he will scrutinize it closely, and unless the evidence is overwhelming, he will refuse to believe it. If, on the other hand, he is offered something which affords a reason for acting in accordance to his instincts, he will accept it even on the slightest evidence. The origin of myths is explained in this way.

We have in fact, two kinds of morality, side by side: one which we preach, but do not practice, and another which we practice, but seldom preach.

Be scrupulously truthful, even if the truth is inconvenient, for it is more inconvenient when you try to conceal it.

When you meet with opposition, even if it should be from your husband or your children, endeavor to overcome it by argument and not by authority, for a victory dependent upon authority is unreal and illusory.

Neither acquiescence in skepticism nor acquiescence in dogma is what education should produce.

Happiness is not best achieved by those who seek it directly.