"A critical question to ask is, 'What is the Gospel?' The gospel is the good news of Jesus Christ and the power of the gospel is Jesus Christ. Tim Keller defines the gospel: 'Through the person and work of Jesus Christ on our behalf, God saves sinners by grace, rescuing them from judgment for their sin into fellowship with him now in the church and ultimately in the new heavens and new earth. To receive this salvation, we must repent and believe this gospel.' The pre-existent Son of God (John 1:1 , 14), Jesus Christ, who took on human flesh and was born of the Virgin Mary (Luke 1:31 ; 2:7), lived a sinless life (Hebrews 4:15 ), began his earthly ministry at thirty years old, and became a servant of God who boldly and obediently proclaimed the gospel (Mark 1:14-15 ). At the hands of those who hated him, he willingly died on the cross for our sins and paid its full penalty, exchanged his life for our life, cancelled our debt, and defeated the power of evil once and for all time (Isaiah 53:4-6 ; Mark 10:45 ; Colossians 2:13-15 ; I Peter 3:18; I John 2:2 ). He was buried and on the third day was raised from the dead for our sins (I Corinthians 15:3-6). God's justice and wrath were duly served with Christ's death on the cross and subsequent resurrection from the dead so that those who by the grace and mercy of God repent of their sins and put their trust and faith in Christ are justified in his sight (Acts 2:38 ; Romans 3:24-26 ; Galatians 3:26 ; Ephesians 2:8-9 )."