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It's not what we don't know that hurts. It's what we know that ain't so.

It isn't what we don't know that gives us trouble. It's what we know that ain't so.

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Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns — the ones we don't know we don't know. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.

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

What gets us into trouble is not what we don't know. It's what we know for sure that just ain't so.

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

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