ἔγνω δὲ φώρ τε φῶρα καὶ λύκος λύκον → the thief knows the thief and the wolf knows the wolf, and thief knows thief and wolf his fellow wolf, set a thief to catch a thief
maxim: P. and V. λόγος, ὁ, παροιμία, ἡ, γνῶμαι, αἱ.
advice: P. and V. βουλή, ἡ, παραίνεσις, ἡ, P. συμβουλία, ἡ.
admonition: P. and V. νουθέτησις, ἡ, νουθέτημα, τό.