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In general we are least aware of what our minds do best.

Nothing is so firmly believed as what we least know.

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

Far more crucial than what we know or do not know is what we do not want to know.

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

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

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

Knowledge is invariably a matter of degree: you cannot put your finger upon even the simplest datum and say this we know.

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

The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant.