Philosophy begins when you realize how weak and unable you are with important things — at least if you're approaching it the right way. We aren't born knowing what a right-angled triangle is, or what a quarter-tone in music is, or what a half-tone is. We learn these things through teaching and practice. That's why people who don't know these things don't pretend they know them.
The beginning of philosophy, to him at least who enters on it in the right way and by the door is a consciousness of his own weakness and inability about necessary things; for we come into the world with no natural notion of a right-angled triangle, or of a diesis (a quarter tone), or of a half-tone; but we learn each of these things by a certain transmission according to art; and for this reason those who do not know them do not think that they know them.