John Calvin Reformed @genevareformer

9. Not of works. Instead of what he had said, that their salvation is of grace, he now affirms, that “it is the gift of God.” “Καὶ τοῦτο οὐκ ἐξ ὑμῶν. It has been not a little debated, among both ancient and modern commentators, to what noun τοῦτο should be referred. Some say, to πίστωες; others, to χάριτι; though on the sense of πίστις they differ in their views.

Matthew Henry Presbyterian @wholebiblehenry

Here the apostle begins his account of the glorious change that was wrought in them by converting grace, where observe, I. By whom, and in what manner, it was brought about and effected. 1. Negatively: Not of yourselves, Eph 2:8.

Commenting on Ephesians 2:4-10

John Gill Reformed Baptist @doctorgill

Not of works,.... Of any kind, moral or ceremonial, before or after conversion, done without faith or in it, nor of these in any sense; works are neither the moving causes, nor the procuring causes, nor the helping causes, nor "causa sine qua non", or conditions of salvation; the best works that are done by men, are not done of themselves, but by the grace...