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You can't know what you don't know. You can't know about things you have yet to discover.

To know what you know and what you do not know, that is true knowledge.

Knowledge is a beautiful thing, but there are a few things I wish I didn't know.

You know a lot, but you don't know everything.

To know, is to know that you know nothing. That is the meaning of true knowledge.

I know nothing except the fact of my ignorance.

I know nothing, except the fact of my ignorance.

We know a lot of things, but what we don't know is a lot more.

All thing I thought I knew; but now confess, the more I know I know, I know the less.