Jamieson, Fausset and Brown on Ephesians 2:10

10. workmanship--literally, "a thing of His making"; "handiwork." Here the spiritual creation, not the physical, is referred to (Ep 2:8, 9).

created--having been created (Ep 4:24; Psa 102:18; Is 43:21; 2Co 5:5, 17).

unto good works--"for good works." "Good works" cannot be performed until we are new "created unto" them. Paul never calls the works of the law "good works." We are not saved by, but created unto, good works.

before ordained--Greek, "before made ready" (compare Joh 5:36). God marks out for each in His purposes beforehand, the particular good works, and the time and way which tie sees best. God both makes ready by His providence the opportunities for the works, and makes us ready for their performance (Joh 15:16; 2Ti 2:21).

that we should walk in them--not "be saved" by them. Works do not justify, but the justified man works (Ga 5:22-25).