Philippians 4:10 "But I rejoiced in the Lord greatly that now at last your care for me has flourished again; though you surely did care, but you lacked opportunity. 11 Not that I speak in regard to need, for I have learned in whatever state I am, to be content: 12 I know how to be abased, and I know how to abound. Everywhere and in all things I have learned both to be full and to be hungry, both to abound and to suffer need. 13 I can do all things through Christ who strengthens me."
Apparently the Philippian church found a way to get a care package of some sort to Paul. He thanks them for it in the most bizarre way. He basically says it was nice of them but that he didn't need it. It almost sounds rude.
Imagine giving a gift to someone and their response is "Wow it was nice of you to do this but I don't need it. I've learned to get along with or without."
Why does he say anything? Why not just say thank you and stop?
Remember he's talking to a church stressed, divided and doubting because life isn't currently going smoothly or fairly. Their sense of justice and their immature view of God is screaming at them that things should not be the way they are and they are doubting God and in their stress turning on each other
From various angles Paul is addressing their state of mind that is dragging them down. His latest angle is to explain that His peace and contentment is not tied to his stuff. He can enjoy nice things and he can also get by without. Employed is great. Unemployed is survivable. Free is great but he can handle prison too. Being respected and accepted is wonderful but he can handle being treated like a criminal or like a fool as well.
He is trying by example to show them that when our confidence and security and sense of worth comes from Christ the world can do whatever they wish or say whatever they wish or take away whatever they wish and we remain unfazed and unchanged.
Just imagine how different Jesus' life and ministry would have been if He needed the approval of men or a certain standard of living?
We can thrive in any situation if we don't get circumstancial blindness and lose perspective. If God be for us, who or what can be against us? We can do all things in and through His strength.