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What we call 'evil' doesn't necessarily deserve any kind of respect or understanding, by any means; it just deserves an acknowledgement of its complexity so we can better understand it - so we can help prevent it.

If they exert it not for good, they will for evil; if they advance not knowledge, they will perpetuate ignorance.

We must not indulge in unfavorable views of mankind, since by doing it we make bad men believe they are no worse than others, and we teach the good that they are good in vain.

Ignorance of all things is an evil neither terrible nor excessive, nor yet the greatest of all; but great cleverness and much learning, if they be accompanied by a bad training, are a much greater misfortune.

We are coming out of a century that was taught that one way of looking at the world, that one form of behavior, is as valid as another. The idea of true evil has been blown away.

The only good is knowledge, and the only evil is ignorance.

There is such a thing as doing good that evil may come.

Ignorant kindness may have the effect of cruelty; but to be angry with it as if it were direct cruelty would be an ignorant unkindness.

Human nature is evil, and goodness is caused by intentional activity.