The object of teaching and learning is to enable students to get along without their teachers.
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"The self-taught man seldom knows anything accurately, and he does not know a tenth as much as he could have known if he had worked under teachers, and besides, he brags, and is the means of fooling other thoughtless people into doing as he himself has done."
Mark Twain
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"You got to be careful if you don't know where you're going, because you might not get there."
Yogi Berra