Jamieson, Fausset and Brown on Philippians 4:11

11. I have learned--The I in Greek is emphatical. I leave it to others if they will, to be discontented. I, for my part, have learned, by the teaching of the Holy Spirit, and the dealings of Providence (He 5:8), to be content in every state.

content--The Greek, literally expresses "independent of others, and having sufficiency in one's self." But Christianity has raised the term above the haughty self-sufficiency of the heathen Stoic to the contentment of the Christian, whose sufficiency is not in self, but in God (2Co 3:5; 1Ti 6:6, 8; He 13:5; compare Jr 2:36; 45:5).