Paul continues to paint a picture for the believers at Philippi of a journey that we are on towards Christ-likeness. It is clear that Christ's purpose was not only to save us from hell, but also bring us back to reflecting the glory of God the way we were originally intended. Paul uses terms like "press on" and "strain forward" to describe the appropriate response for someone who has been claimed by Christ and now walks as a new creation with a regenerated heart.
Additional Scripture References:
2 Corinthians 7:10, Romans 7:14-25, Hebrews 12:6, Romans 16:18, Romans 6:21