How is the Christian life lived according to Galatians 2:20?

Les explains that Paul's classic statement in Galatians 2:20 is that he is crucified with Christ. That crucifixion is by identification with Christ's death, yet Paul still lives; the life he now lives in the flesh is lived by the faith—or, as Les prefers, the faithfulness of the Son of God. The Gospel's function is that Christ died for the sins of the world, was buried, and rose from the dead. When a person comes under that forgiveness, everything—past, present, and future—is forgiven because of what Christ accomplished, not because of anything we have done. Though beyond human comprehension, it is believed because the Book teaches it, and believers will never come into God's presence with sin on their back.