For the NT sense of “walk” see on v. 2. The walk here described is in contrast with that described in v. 2. Walking in good works should be a habitual practice, not as something demanded, but as a natural expression of the new life that has been created in the believer. If one is not walking in good works, it may reasonably be asked whether he has received grace. The Architect of the universe is also the Architect of souls, working according to an eternal purpose (ch. 1:4). God has provided not only the opportunity for good works but also the means for their performance (John 15:16; 2 Tim. 2:21).

Or, “prepared beforehand.” Before creation it was planned that those saved by grace should have good works as a witness to the fact. That sequence was written into the spiritual code by which man was to live.

 Of himself man cannot bring forth good works. It is necessary for him to be spiritually re-created in Christ before he can produce the good works God purposes he shall bring forth. By a change of the will, affections, and purposes the privilege and duty of witnessing by good works become possible (Matt. 5:14-16).

Gr. poiēma, “that which is made or done,” “a work,” “a creation.” The English word “poem” is derived from poiēma. The reference here is to God’s spiritual re-creation of man. We are remade by Him for the purpose of “good works.”