THE GOSPEL OF THE GRACE OF GOD
Acts 20:24 - But none of these things move me; nor do I count my life dear to myself, so that I may finish my race with joy and the ministry which I received from the Lord Jesus, to testify to the gospel of the grace of God.
Grace, by definition, is undeserved favor (approval, kindness, forgiveness), which is exactly what God has done for us in sending Jesus to die on the cross as payment for our sins. We do deserve to be punished for our sins, but God knew the price was just too steep for us to pay, so He and Jesus paid it for us.
Romans 6:12 - Therefore do not let sin reign in your mortal body
John 1:17 - For the law was given through Moses, but grace and truth came through Jesus Christ.
Hebrews 13:8-9 - Jesus Christ is the same yesterday, today, and forever. 9 Do not be carried about with various and strange doctrines. For it is good that the heart be established by grace.