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

Since we cannot know all that there is to be known about anything, we ought to know a little about everything.

The remarkable position in which we find ourselves is that we don't actually know what we actually know.

We know next to nothing of what we're going to know in 20 or 50 years.

Knowledge is knowing that we cannot know.

Knowledge is sometimes superfluous: when we need it, we have it not.

How many things there are concerning which we might well deliberate whether we had better know them.

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

I think knowing what you cannot do is more important than knowing what you can.