John Calvin Commentary Philippians 1:4

"always in every supplication of mine on behalf of you all making my supplication with joy," — Philippians 1:4 (ASV)

Always in every prayer. Connect the words in this manner: “Always presenting prayer for you all in every prayer of mine.” For as he had said before, that remembering them was an occasion of joy to him, so he now adds that they come into his mind as often as he prays. He afterwards adds that it is with joy that he presents prayer on their behalf.

Joy refers to the past; prayer to the future. For he rejoiced in their auspicious beginnings and desired their perfection. Therefore, we should always rejoice in the blessings received from God in such a way as to remember to ask Him for what we still need.