Any teacher can study books, but books do not necessarily bring wisdom, nor that human insight essential to consummate teaching skills.

But ah, to fish with a worm, and then not catch your fish! To fail with a fly is no disgrace: your art may have been impeccable, your patience faultless to the end. But the philosophy of worm-fishing is that of results, of having something tangible in your basket when the day's work is done.