What does God work in? The Holy Spirit’s witness. What does the Christian work out? The Holy Spirit’s witness manifested in the heart and life of a believer in Christ. The Holy Spirit’s witness is a “perfect” work that morally changes the unbelieving rebel against God into a believing and obedient saint of God.
The Spirit’s Witness flows from the blood of the everlasting covenant that Christ shed on the Cross of Calvary into the heart of a believer. God works in so much that a sinner is made right through the shed blood of Jesus Christ our Savior. Now, the child of God changed by Grace is able to work out things that are well pleasing in the eyes of God.
Moral righteousness comes from the redemptive work of Christ and flows into the believing soul. Forgiveness and righteousness are the result of God’s workmanship upon this believing soul. The Blood of the everlasting covenant allows God to work in so the Christian can work out.
Hebrews 13:20-21…Now the God of peace, that brought again from the dead our Lord Jesus, that great shepherd of the sheep, through the blood of the everlasting covenant, Make you perfect in every good work to do his will, working in you that which is wellpleasing in his sight, through Jesus Christ
Phillipians 2:12-14…Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling. For it is God which worketh in you both to will and to do of his good pleasure.