"Gæð a wyrd swa hio scel, ac gecnáwan þín gefá!": "Fate goes ever as she shall, but know thine enemy!".
I can teach you with a quip, if I've a mind; I can trick you into learning with a laugh; Oh, winnow all my folly and you'll find, A grain or two of truth among the chaff!
(The Yeoman of the Guard ~ Gilbert and Sullivan)