Workmanship (poiēma). Old word from poieō with the ending ̇mat meaning result. In N.T. only here and Rev 1:20.
Created (ktisthentes). First aorist passive participle of ktizō, not the original creation as in Col 1:16; Eph 3:9, but the moral and spiritual renewal in Christ, the new birth, as in Eph 2:15; Eph 4:24.
For good works (epi ergois agathois). Probably the true dative of purpose here with epi (Robertson, Grammar, p. 605). Purpose of the new creation in Christ.
Which (hois). Attraction of the relative ha (accusative after proētoimasen) to case of the antecedent ergois.
Afore prepared (proētoimasen). First aorist active indicative of proētoimazō, old verb to make ready beforehand. In N.T. only here and Rom 9:23. Good works by us were included in the eternal foreordination by God.
That we should walk in them (hina en autois peripatēsōmen). Expexegetic final clause explanatory of the election to good works.