Jamieson, Fausset and Brown on Philippians 1:4

4. making request--Translate, "making my request."

for you all--The frequent repetition in this Epistle of "all" with "you," marks that Paul desires to declare his love for all alike, and will not recognize any divisions among them.

with joy--the characteristic feature in this Epistle, as love is in that to the Ephesians (compare Php 1:18; Php 2:2, 19, 28; 3:1; 4:1, 4). Love and joy are the two first-fruits of the Spirit. Joy gives especial animation to prayers. It marked his high opinion of them, that there was almost everything in them to give him joy, and almost nothing to give him pain.