You are God's workmanship, by grace through faith in Christ (Ephesians 2:8-10). Your salvation is the eternal purpose and work of God the Father. Your salvation was purchased through the Son of God at the cross. Christ is effectively working in you by the Holy Spirit.
God chose to save believers in Christ before the world began (Ephesians 1:4-6). God's eternal purpose in Christ was foreordained. God called you through the gospel to be justified by faith in Christ. That is God working in you through Christ.
God the Father works through Christ to save you. Jesus accomplished the Father's will through His sacrificial death and resurrection. That is the gospel of your salvation in Christ (1 Corinthians 15:1-4). God the Father works through the Son to save all who believe.
The Holy Spirit is working in you through Christ (Romans 8:9). "He who has begun a good work in you will complete unto the day of Jesus Christ" (Philippians 1:6). The Holy Spirit changes your life through faith in Christ. You are transformed by the Holy Spirit to walk in newness of life, through Jesus Christ our Lord (Romans 6:4, 12:2; 1 Corinthians 12:3). That's God's work in you.
