19. my--Paul calls God here "my God," to imply that God would reward their bounty to HIS servant, by "fully supplying" (translate so, literally, fill to the full) their every "need" (2Co 9:8), even as they had "fully" supplied his "need" (Php 4:16, 18). My Master will fully repay you; I cannot. The Philippians invested their bounty well since it got them such a glorious return.
      according to his riches--The measure of His supply to you will be the immeasurable "riches of His grace" (Eph 1:7).
      in glory--These words belong to the whole sentence. "Glory" is the element in which His rich grace operates; and it will be the element IN which He will "supply fully all your need."
      by Christ Jesus--by virtue of your being "IN" (so Greek, not "by") Christ Jesus, the Giver and Mediator of all spiritual blessings.

JFB.