In Ephesians 3:14-21 Paul returns to the thought he began in chapter 3, verse 1. After his parenthesis about his ministry and God’s plan to demonstrate His Great Plan through the church, he now prays that the Ephesians will experience even more of the “glorious riches” of the Father. He prays that they will be strengthened, that Christ will permanently dwell within them, and that they will be able to fully grasp how great God’s love for them is.
Every epistle by Paul except II Corinthians and Titus contains one or more explicit prayers by him. One such list can be found here. Our present passage is the second of three prayers found here in Ephesians (1:15-23; 6:19-20). He will then complete his “theological” teaching, and begin the next chapter with how the believers should live out God’s Great Plan in their lives and in His church.