The Apostle Paul reminds us to work OUT our salvation with fear and trembling which is certainly not a working FOR our salvation but simply living it out (Phil. 2:12). This presents for us the Full Gospel teaching that Christ came to give His Life for us so that He could live His Life through us to the glory of the Father. One of my former seminary profs, Dr. Simon Kistemaker, rightly exhorts us in his commentary on 2 Peter, “Even though the initiative in salvation comes from God, he works out our sanctification by putting us to work.” We are rightly taught the doctrine of the full gospel when Ephesians 2:8,9 is taught with verse 10…
8 For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God— 9 not by works, so that no one can boast. 10 For we are God’s workmanship, created in Christ Jesus to do good works, which God prepared in advance for us to do.
Walking according to the Spirit is the grateful response of our hearts to the gospel as God’s Spirit operates in us to produce uncoerced virtue and spontaneous activity to glorify Him.