A.B. Simpson comments on this verse:
Christ sends us to serve Him, not in our own strength, but in His resources and might. We are His workmanship, created in Christ Jesus unto good works, which God hath prepared that we should walk in them. We do not have to prepare them; but to wear them as garments, made to order for every occasion of our life.
We must receive them by faith and go forth in His work, believing that He is with us, and in us, as our all sufficiency for wisdom, faith, love, prayer, power, and every grace and gift that our work requires. In this work of faith we shall have to feel weak and helpless, and even have little consciousness of power.
But if we believe and go forward, He will be the power and send the fruits.
The most useful services we render are those which, like the sweet fruits of the wilderness, spring from hours of barrenness. I will bring her into the wilderness and I will give her vineyards from thence. Let us learn to work by faith as well as walk by faith, then we shall receive even the end of our faith, the salvation of precious souls, and our lives will bear fruit which shall be manifest throughout all eternity.
Such an amazing theme of grace, that God has prepared the works for us. We don't have to work them up or stress ourselves in finding them. We don't need to strive in discerning or creating them. They are prepared beforehand.
We simply must trust. We must receive the promise, by faith. We must obey in the next thing at the door of our conscience. Like this, God will lead us into all good works, even silent or unseen by others (or perhaps not even recognized by ourselves).
Tolstoy has written a short story of a shoe cobbler who entertains the Lord by accident, without knowing that he did so (merely by helping a cold woman, abandoned orphan and lonely man in the course of his day). So it is with us: we will do the destined works, as we simply trust and obey.
And, it's so important (especially in our world of celebrity, glamor and materially defined success) not to "compare ourselves among ourselves" (2 Cor. 10:12). There's no quicker way to lose sight of the prepared works of God than to compare personal life against the celebrated works of others.
Truly, "Let us learn to work by faith as well as walk by faith, then we shall receive even the end of our faith, the salvation of precious souls, and our lives will bear fruit which shall be manifest throughout all eternity."