Smartyfair
All teachers make mistakes sometimes, and you may depend upon it that it is an excellent teacher and a person of fine character who, when he or she has made a mistake, says frankly and plainly, "I have made a mistake," or "I don't know." It takes a very good and a very bright teacher to say, "I don't know." No teacher knows everything about every subject.

Where these words come from

How sure this is
Lots of sources credit Booker T. Washington with this, and they agree with each other. The book or the speech it first came from hasn't turned up yet.
What turned up
https://www.gutenberg.org/ebooks/60484

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