From Muriel Barbery’s The Elegance of the Hedgehog:
[I]t was one of Papa’s guests, at the dinner party yesterday, who said: “Those who can, do; those who can’t, teach; those who can’t teach teach the teachers; and those who cant’ teach the teachers go into politics.”…
…What his sentence 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 it’s words and not deeds that have power, 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 a rabbit home for dinner or procreating properly. Humans live in a world where the weak are dominant. This is a terrible insult to our animal nature, a sort of perversion or a deep contradiction.
Politics and Prosperity 