There is but one evil, ignorance.

Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.

Beware of false knowledge; it is more dangerous than ignorance.

There is only one way to put an end to evil, and that is to do good for evil.

Ignorance is the curse of God; knowledge is the wing wherewith we fly to heaven.

I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent.