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You should be smart enough to know that you don't know everything. But you have to believe in yourself. I certainly do.

I don't pretend I know everything.

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

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

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.

I'm sure that I don't know everything I want to know. I have so much more to learn.

We all not only could know everything. We do. We just tell ourselves we don't to make it all bearable.

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