“Those who can't do, teach. And those who can't teach, teach gym.”

“Those who can do, those who can't teach.”

“Those who can -- do. Those who can't -- teach.”

“Those who know, do. Those that understand, teach.”

“But that's not even the problem. What his sentence (Those who can, do; those who can't, teach; those who can't teach teach the teachers and those who can't teach the teachers go into politics.) means isn't that incompetent people have found their place in the sun, but that nothing is harder or more unfair than human reality: humans live in a world where the ultimate skill is mastery of language. This is a terrible thing because basically we are primates who've been programmed to eat, sleep, reproduce, conquer and make our territory safe, and the ones who are most gifted at that, the most animal types among us, always get screwed by the others, the fine talkers, despite these latter being incapable of defending their own garden or bringing rabbit home for dinner or procreating properly. Humans live in a world where the weak are dominant.”

“The authority of those who teach is often an obstacle to those who want to learn.”