To know that we know what we know, and that we do not know what we do not know, that is true knowledge.
The simplest questions are the hardest to answer.
They know enough who know how to learn.
Strange how much you've got to know Before you know how little you know.
I take all knowledge to be my province.
To be conscious that you are ignorant is a great step to knowledge.
For knowledge, too, is itself a power.
The only good is knowledge, and the only evil ignorance.
He that increaseth knowledge increascth sorrow.
Our knowledge is the amassed thought and experience of innumerable minds.
One cannot know everything.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
He who knows others is learned; He who knows himself is wise.
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.
Better know nothing than half-know many things.
He that hath knowledge spareth his words.
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.
We know what we are, but know not what we may be.
And seeing ignorance is the curse of God, Knowledge the wing wherewith we fly to heaven.