Parallel
2 Corinthians 3:5
Patriarchal Greek New Testament (1904) · Berean Standard Bible
οὐχ ὅτι ἱκανοί ἐσμεν ἀφ᾽ ἑαυτῶν λογίσασθαί τι ὡς ἐξ ἑαυτῶν, ἀλλ᾽ ἡ ἱκανότης ἡμῶν ἐκ τοῦ Θεοῦ,
Not that we are competent in ourselves to claim that anything comes from us, but our competence comes from God.