Chapter divisions did not appear in Paul’s original writing, and there is no separation between ch. 3:21 and this verse. The apostle draws an exhortatory conclusion from ch. 3:20, 21, and admonishes firmness in the faith.

 A favorite expression of Paul, who uses it approximately 40 times (Rom. 16:2, 8, 11-13, 22; etc.). See on Rom. 8:1 for the equivalent phrase “in Christ Jesus.”

 Gr. stēkō (see on ch. 1:27). In view of the glorious prospect painted in ch. 3:20, 21, Paul encourages the Philippians to be steadfast. He bids them to be worthy of their heavenly citizenship.

 Gr. stephanos, “a victor’s chaplet,” not a royal diadem (see on Matt. 27:29; Rev. 12:13). The Philippians were Paul’s crown of victory, showing that the apostle had not run in vain (Phil. 2:16).

 The Philippian believers were the objects or the causes of the apostle’s joy. Paul uses the same words in speaking of the Thessalonians (1 Thess. 2:19).

 The apostle seems scarcely able to find words adequate to express his love for the Philippians. He heaps together terms of affection, dwelling especially on the word “beloved.” He tells them of his longing to see them, repeating the sentiments of ch. 1:8.