Answer: God's gift to us IN Christ is eternal life, (Romans 6, verse 23). When we are set free from sin and become slaves to God, the benefit to us leads to holiness. The result of this holiness is eternal life, (Romans 6, verse 22).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
1 Peter 1:15-16: "But just as He Who called you is holy, so be holy in all you do; for it is written: ‘Be holy, because I am holy.'"
1 Peter 2:9: "But you are a chosen people, a royal priesthood, a holy nation, a people belonging to God, that you may declare the praises of Him Who called you out of darkness into His wonderful light."
1 John 5:20: "We know also that the Son of God has come and has given us understanding, so that we may know Him Who is True. And we are in Him Who is True--even in His Son Jesus Christ. He is the True God and Eternal Life."