Ὁ κόσμος σκηνή, ὁ βίος πάροδος· ἦλθες, εἶδες, ἀπῆλθες → The world is a stage, life is your entrance: you came, you saw, you departed (Democritus fr. 115 D-K)
P. ἐπιτηδειότης, ἡ, or use P. and V. τὸ ἐπιτήδειον.