ἀφ' ἑαυτοῦ γνώμης
From LSJ
οὕτως καὶ ἡ πίστις, ἐὰν μὴ ἔχῃ ἔργα, νεκρά ἐστιν καθ' ἑαυτήν → so even the Faith, if it does not have deeds, and is on its own, is dead | the Faith without works is dead
Greek > English (Woodhouse)
on his own initiative, on one's own authority, on one's own responsibility