ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
δῆλον: adv. (тж. δ. δέ) ясно, очевидно, действительно Soph., Thuc., Arst., Theocr.