St. John Chrysostom, Homily XV on Philippians 4:10-14, Homilies on Philippians, Colossians, and Thessalonians.
This is a fascinating section of Paul’s Epistle to the Philippians. He mentions their gift to him, rejoices for it, chastises them for their tardiness in giving, excuses that tardiness and then tells them that, through the gift, they share in his labors.
Paul rejoices, not because his needs were met, but because they met his needs. His joy came from knowing that the faith of the Philippians had grown enough so that they were willing to share in his suffering.