Human nature is not of itself vicious.
There seems to be some perverse human characteristic that likes to make easy things difficult.
My nature is subdued to what it works in, like the dyer's hand.
The principle that human nature, in its psychological aspects, is nothing more than a product of history and given social relations removes all barriers to coercion and manipulation by the powerful.
There is nothing that can be changed more completely than human nature when the job is taken in hand early enough.
It is not human nature we should accuse but the despicable conventions that pervert it.
There is a great deal of human nature in people.
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.
It is almost impossible to smile on the outside without feeling better on the inside.
Now I believe I can hear the philosophers protesting that it can only be misery to live in folly, illusion, deception and ignorance, but it isn't --it's human.
Too many people confine their exercise to jumping to conclusions, running up bills, stretching the truth, bending over backward, lying down on the job, sidestepping responsibility and pushing their luck.
It is human nature to think wisely and act foolishly.