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An ignorant person is one who doesn't know what you have just found out.

To be ignorant of one's ignorance is the malady of the ignorant.

Everybody is ignorant, only on different subjects.

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.

I know nothing except the fact of my ignorance.

We are all born ignorant, but one must work hard to remain stupid.

I know nothing, except the fact of my ignorance.

The highest form of ignorance is when you reject something you don't know anything about.

I do not have a brain that I long for in dealing with matters of which I am ignorant - that don't come within my ken and a rationale, a reason, an argument and so on - and I can't do that, and I'm not in that bracket at all.