Christology
Philippians has been the subject of much research and Ralph P. Martin argues that Philippians 2 may be considered the beginning of the field of Christology, specifically referring to the rich analysis that Apostle Paul began in Philippians 2:5-6. Veronica Koperski views Philippians 3:10 as the beginning of the analysis of the knowledge of Christ.
While Paul's opening prayer is for love (1:9), based on knowledge of Christ, his final prayer is for the peace of God (4:7), which surpasses all understanding. Thus the concepts of love, knowledge and peace are jointly developed in the Epistle.
Read more about this topic: Epistle To The Philippians