There is but one evil, ignorance.

That within the best of us, there is some evil, and within the worst of us, there is some good. When we come to see this, we take a different attitude toward individuals.

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.

Whatever is done for love always occurs beyond good and evil.

Close beside my knowledge lies my black ignorance.

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