The more one thinks, the more one feels the hopeless immensity of man's 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.

Education is the path from cocky ignorance to miserable uncertainty.

The truth hurts, but silence kills.

Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.

Nothing strengthens authority so much as silence.