As for me, all I know is that I know nothing. - Socrates

And seeing ignorance is the curse of God, Knowledge the wing wherewith we fly to heaven. - William Shakespeare

We know what we are, but know not what we may be. - William Shakespeare

Then I began to think, that it is very true which is commonly said, that the one-half of the world knoweth not how the other half liveth. - Rabelais

He that hath knowledge spareth his words. - Proverbs

Better know nothing than half-know many things. - Friedrich Nietzsche

It ain't the things you don't know what gets you into trouble; it's the things you know for sure what ain't so. - Negro Saying

One cannot know everything. - Horace

He who knows others is learned; He who knows himself is wise. - Lao-Tsze

Our knowledge is the amassed thought and experience of innumerable minds. - Ralph Waldo Emerson

He that increaseth knowledge increascth sorrow. - Bible

To be conscious that you are ignorant is a great step to knowledge. - Benjamin Disraeli

The only good is knowledge, and the only evil ignorance. - Diogenes

Strange how much you've got to know Before you know how little you know. - Anonymous

They know enough who know how to learn. - Henry Adams

To know that we know what we know, and that we do not know what we do not know, that is true knowledge. - Henry David Thoreau

Man is not weak - knowledge is more than equivalent to force. The master of mechanics laughs at strength. - Samuel Johnson

Knowledge is power. - Francis Bacon

In all affairs, love, religion, politics or business, it's a healthy idea, now and then, to hang a question mark on things you have long taken for granted. - Bertrand Russell

It isn't what we don't know that gives us trouble, it's what we know that ain't so. - Will Rogers