It is not human nature we should accuse but the despicable conventions that pervert it.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

It is human nature to think wisely and act foolishly.

Nature is trying very hard to make us succeed, but nature does not depend on us. We are not the only experiment.

Give a small boy a hammer and he will find that everything he encounters needs pounding.

There is an electric fire in human nature tending to purify -- so that among these human creatures there is continually some birth of new heroism. The pity is that we must wonder at it, as we should at finding a pearl in rubbish.

We are all murderers and prostitutes --no matter to what culture, society, class, nation one belongs, no matter how normal, moral, or mature, one takes oneself to be.

I have never, in all my various travels, seen but two sorts of people I mean men and women, who always have been, and ever will be, the same. The same vices and the same follies have been the fruit of all ages, though sometimes under different names.

Human nature is not of itself vicious.

It is a pleasure to give advice, humiliating to need it, normal to ignore it.

Really I don't like human nature unless all candied over with art.