Paul is confined in a Roman prison while writing this letter to the church at Philippi. He begins chapter 4 with greetings to his fellow co-laborers in the work of the ministry. then he sets forth the prelude to our main text:
4 Rejoice in the Lord always [delight, take pleasure in Him]; again I will say, rejoice! 5 Let your gentle spirit [your graciousness, unselfishness, mercy, tolerance, and patience] be known to all people. The Lord is near. 6 Do not be anxious or worried about anything, but in everything [every circumstance and situation] by prayer and petition with thanksgiving, continue to make your [specific] requests known to God. 7 And the peace of God [that peace which reassures the heart, that peace] which transcends all understanding, [that peace which] stands guard over your hearts and your minds in Christ Jesus [is yours]. v. 4-7 (AMP)
Note how Paul even in very difficult circumstances begins with Rejoice in the Lord always! Next he says Do not be anxious or worried about anything this from a guy facing probable execution. Finally he invokes the peace of God.
How can someone in his circumstances write of such things? it is simple and he lays it all out in our main text think on the things of GOD.
Observation: What did I read? What verse(s) strikes you as most meaningful?
Interpretation: What does it mean? Overall and the most meaningful verses?
Application: How does it apply to me?
Implementation: What do I do? How can I apply it to me today?