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While some of us may know than others about certain things, it is the thinnest slice of all that is, or could be known. In that sense, we are all profoundly ignorant.

Most ignorance is vincible ignorance. We don't know because we don't want to know.

It seems to me that we are profoundly ignorant of ourselves.

To know anything well involves a profound sensation of ignorance.

I know nothing except the fact of my ignorance.

I know nothing, except the fact of my ignorance.

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

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

There is not anything that can so suddenly flood the mind with shame as the conviction of ignorance, yet we are all ignorant of nearly everything there is to be known.

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