Knowing something and understanding it were not the same thing.

“Knowing something as knowledge” and “realizing” are different. You have to realize.

What I know and what I feel are two very different things.

Knowing what a person believes on a certain subject is not identical to knowing how that person thinks.

'Yes, Professor, knowledge and understanding are quite different. Only understanding can lead to being, whereas knowledge is but a passing presence in it. New knowledge displaces the old and the result is, as it were, a pouring from the empty into the void.

Knowledge about a thing is not the thing itself.

To know is one thing, and to know for certain that we know is another.

Why do we know what we know and why don't we know what we don't know? What should we know and what shouldn't we know? How might we know differently?

There's a big difference between knowing the name of something and knowing something.

When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it — this is knowledge.

Reason, or the ratio of all we have already known, is not the same that it shall be when we know more.

Suspecting and knowing are not the same.

Knowledge is one thing, virtue is another.

What distinguishes knowledge is not certainty but evidence.