We work out, while God is working in…two separate actions, for two separate roles. We are to “work out” our salvation with fear and trembling, not trying to accomplish or earn our salvation, but to “work it out” in order to exhibit unshakeable faith, trust, and hope. This “working out” of our salvation is a life-long process you may hear called Sanctification. In Hebrews 13:21 it tells us that Jesus equips us with everything good for doing His Will as He “works in” us what is pleasing to Him. But remember these roles are set…for there’s no amount of human effort, will, or work that can bring about the “Working in” that the Lord alone does in our life. For only He can “work in” our lives through every good and righteous thing.