Clement of Alexandria — Stromata 3.7.57
Among the Greek philosophers, human self-control claims to fight desire and not to serve it in deeds. Among us it is not to desire at all — not that someone who desires should merely tough it out, but that he should be continent even of desiring. And this self-control cannot be received in any other way than by the grace of God. That is why he said, “Ask, and it will be given you.”
Greek
Ἡ μὲν οὖν ἀνθρωπίνη ἐγκράτεια, ἡ κατὰ τοὺς φιλοσόφους λέγω τοὺς Ἑλλήνων, τὸ διαμάχεσθαι τῇ ἐπιθυμίᾳ καὶ μὴ ἐξυπηρετεῖν αὐτῇ εἰς τὰ ἔργα ἐπαγγέλλεται· ἡ καθ’ ἡμᾶς δὲ τὸ μὴ ἐπιθυμεῖν, οὐχ ἵνα τις ἐπιθυμῶν καρτερῇ, ἀλλ’ ὅπως καὶ τοῦ ἐπιθυμεῖν ἐγκρατεύηται. λαβεῖν δὲ ἄλλως οὐκ ἔστι τὴν ἐγκράτειαν ταύτην ἢ χάριτι τοῦ θεοῦ. διὰ τοῦτο εἶπεν «αἰτεῖτε καὶ δοθήσεται ὑμῖν».