The Epistle to the Ephesians is rated right along with Romans. There is a debate concerning whether Romans or Ephesians is the greater of Paul’s epistles. Most scholars opt for Romans, but a number still are convinced that it is Ephesians.
Paul evidently wrote Colossians first in which his themes were Christ and the universe, and Christ and the Church. Then in Ephesians he wrote more about Christ and the Church, and he added the theme of Christ and man.