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

I know a lot of people think I'm dumb. Well, at least I ain't no educated fool.

Half of being smart is knowing what you are dumb about.

You should be smart enough to know that you don't know everything. But you have to believe in yourself. I certainly do.

There is a tendency of people to try to make you believe only a few people are smart. As a brain surgeon, I know better than that.

I know that I am intelligent, because I know that I know nothing.

To be conscious that you are ignorant of the facts is a great step to knowledge.

How do you know what it's like to be stupid if you've never been smart?

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