The acquisition of knowledge always involves the revelation of ignorance-almost is the revelation of ignorance.

When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it: this is knowledge.

Why do we make so much of knowledge, struggle so hard to get some little skill not worth the effort?

The fruit of the tree of knowledge always drives man from some paradise or other; and even the paradise of fools is not an unpleasant abode while it is habitable.

A little learning is a dangerous thing; Drink deep, or taste not the Pierian spring: There shallow draughts intoxicate the brain, And drinking largely sobers us again.

We don't know one millionth of one per cent about anything.

It's what a fellow thinks he knows that hurts him.

From the very beginning of your work, school yourself to severe gradualness in the accumulation of knowledge.

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

It is knowledge that ultimately gives salvation.