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

When you don't know that you don't know, it's a lot different than when you do know that you don't know.

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

To know one thing, you must know the opposite.

I have always been a learner because I knew nothing.

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

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