"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 going and doing as he himself has done."

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I shall stick to our vow: never, never under any circumstances, to say anything unbecoming of the other...The trouble, of course, is that most successful men are prone to some form of vanity. There comes a stage in their lives when they consider it permissible to be egotistic and to brag to the public at large about their unique achievements.

— Nelson Mandela