As a thinker, one should only think of self-education.  The education of youth by others is either an experiment, conducted on one yet unknown and unknowable, or a leveling on principle, to make the new character, whatever it may be, conform to the habits and cutoms that prevail: in both cases, therefore, something unworthy of the thinker – the work of parents and teachers, whom an audaciously honest person has called nos ennemis naturels.

One day, when in the opinion of the world one has long been educated, one discovers onself: that is where the task of the thinker begins; now the time has come to invoke his aid – not as an educator but as one who has educated himself and thus has experience.

Friedrich Nietzsche
from The Wanderer And His Shadow