There is but one evil, ignorance.

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

The true Wisdom is in recognizing our own ignorance.

There is little hope for us until we become toughminded enough to break loose from the shackles of prejudice, half-truths, and downright ignorance.

Thoroughly conscious ignorance is the prelude to every real advance in science.

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