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
οὐσιῶ, -όω (Α) ουσία
1. δίνω υπόσταση, δημιουργώ
2. παθ. οὐσιοῦμαι, -όομαι
υπάρχω ή έχω ουσία («φωνὴ οὐδεμία οὐσίωται, εὐτυχεῖν δὲ καὶ δυστυχεῖν οὐσίαις τισὶν ἐπιλέγεται», Ευστ.).