Rejoice in any circumstances for I am contentment with thanksgiving

Philippians 4:10-14
I rejoiced greatly in the Lord that at last you renewed your concern for me. 
Philippians people provided something to Paul. 
I am not saying this because I am in need, for I have learned to be content whatever the circumstances. 
I know what it is to be in need, and I know what it is to have plenty.I can do all this through him who gives me strength.

Yet it was good of you to share in my troubles.
Why?
Rejoiced greatly in any circumstances, not matter in need or in plenty, because Paul can do it through the Load who gives he strength.
Paul appreciated they gave him when he was in need, but also like to be served by them, share in hi trouble- has some relationship with Paul, has the obligation with gospel.
Paul has learned the secret of contentment, whatever his circumstances.
How?
The secret of contentment is rely on the Load who provides everything. And know what is in need and what is in plenty. Then I will not desire to need something and cause me anxious.
Rejoice in any circumstances for I am contentment with thanksgiving.
Distinguish what is in need and what is my desire?