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Knowledge is knowing that we cannot know.

Knowing is not understanding. There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.

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

Knowledge is the life of the mind.

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

One of the things I do know is we know very little about our universe. Even though we think we know a lot, and we do know a lot more than we used to, we have a lot to learn about our universe.

I've learned that usually, the less I know about other people, the better off I am.

I have always been a learner because I knew nothing.

Knowledge is what we get when an observer, preferably a scientifically trained observer, provides us with a copy of reality that we can all recognize.

People love to be told what they know already.