ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
subs.
Shrewdness: P. and V. σύνεσις, ἡ, P. δεινότης, ἡ, ὀξύτης, ἡ.
