There are four kinds of people, three of which are to be avoided and the fourth cultivated: those who don't know that they don't know; those who know that they don't know; those who don't know that they know; and those who know that they know.

Knowledge is, indeed, that which, next to virtue, truly and essentially raises one man above another.

Yet all that I have learn'd By long experience, and in famous schooles, Is but to know my ignorance at last, Who think themselves most wise are greatest fools.

Knowledge is power.

For all knowledge and wonder is an impression of pleasure in itself.

Knowledge and human power are synonymous, since the ignorance of the cause frustrates the effect.

Knowledge bloweth up, but charity buildeth up.

For knowledge, too, is itself a power.

But thou, O daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased.

For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.

He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.

I may tell all my bones: they look and stare upon me.

I know too much to be conservative or liberal.

Pursuit of knowledge under difficulties.

Men are four: He who knows not and knows not he knows not, he is a fool--shun him; He who knows not and knows he knows not, he is simple--teach him; He who knows and knows not he knows, he is asleep--wake him; He who knows and knows he knows, hi is wise--follow him!

He knew what's what, and that's as high As metaphysic wit can fly.

Deep sighted in intelligence, Ideas, atoms, influences.

Nor do I know what is become Of him, more than the Pope of Rome.

He knew whats'ever 's to be known, But much more than he knew would own.

The tree of knowledge is not that of life.