What is the main theological point of Philippians? I learned recently that many of the epistles have a main theological point. For example, the main point of Ephesians is that the Church is the body of Christ, and that it may bring unity to the world and reconciliation with God. The main point of Colossians is the supremacy of Christ, as he existed before creation. These points can be verified by reading the epistles, or, more briefly, by reading the linked articles on Wikipedia.

This leads me to wonder, what is the main theological point of Philippians? In other words, what is the main theme, from a theological perspective, if there is one?
The Epistle to the Philippians emphasizes the importance of community and unity in the Church.  He congratulates the Philippians for their care towards others (ch 1) and warns against the heresy, particularly the heresy of the Judaizers (3:1-11).

The introduction to the book in the Orthodox Study Bible summarizes:


  Salvation is a dynamic ongoing experience that is not merely personal, but shared among believers.  St. Paul urges the believers in Philippi toward continued unity, humility, selfless generosity, and joy in Christ.