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We are least open to precise knowledge concerning the things we are most vehement about.

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

The secret to discovery is to never believe existing facts.

All we know is still infinitely less than all that remains unknown.

We know accurately only when we know little, with knowledge doubt increases.

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

You know the problem, we don't want to believe what we know.

I know nothing, except the fact of my ignorance.

One can never know enough. The unknown and its call lies even in what we know.

There's nothing you can know that isn't known.