When they bade farewell to the apostle Paul, each was given an epistle to bear to his particular constituency. These four letters are designated the "prison epistles of Paul" since he wrote them while imprisoned in Rome, awaiting a hearing before Nero, the Caesar at that time, to whom Paul, as a Roman citizen, had appealed his case.
This quartet of men and the respective places of abode can be identified:
These epistles present a composite picture of Christ, the church, the Christian life, and the interrelationship and functioning of all three. These different facets present the Christian life on the highest plane.
EPHESIANS presents "the church which is His body" --- this is the invisible church, of which Christ is the head.
COLOSSIANS presents Christ who is "the head of the body, the church." The emphasis is upon Christ rather than on the church.
PHILIPPIANS presents Christian living, with Christ as the dynamic: "I can do all things through Christ which strengtheneth me" ( Philippians 4:13 ).
PHILEMON presents Christian living in action in a pagan society. "If thee count me therefore a partner, receive him as myself. If he hath wronged thee, or oweth thee aught, put that on mine account" Philemon 17, 18 ).
The gospel walked in shoe leather in the first century --- it worked.
In EPHESIANS Christ is exalted above all things, God having "put all things under his feet." Christ is the center of the circle of which the church is the periphery.
In COLOSSIANS Christis the fullness of God (pleroma). he is the periphery of the circle of which Christian living is the center ( Colossians 2:9,10 ).
In PHILIPPIANS Christ is the center of the circle; Christian living is the periphery. The kenosis (emptying) is given ( Philippians+2:5-8 ).
In PHILEMON Christ is both the center and the circumference: "Hearing of thy love and faith, which thou hast toward the Lord Jesus, and toward all the saints" ( Philemon 5 ).