How is Ephesians different from Corinthians and Galatians?
Ephesians differs because it does not reprove problems or correct legalism as Corinthians and Galatians do. Instead, it emphasizes the believer's position in Christ, in the body, and in the heavenlies, using many prepositional phrases such as 'in whom' and 'in Him' to drive home that positional truth.
Les explains that Romans shows sinners and the gospel remedy, Corinthians addresses problems that had to be reproved, and Galatians corrects a return to legalism. But in Ephesians, none of those things are dealt with. Instead, Les teaches, the book hammers home that believers are now positioned in Christ, in the body, and in the heavenlies. He notes there are 90 some prepositional phrases in its six chapters—like 'in whom' and 'in Him'—that constantly denote our position in Christ. The whole book drives the fact that we are now in a peculiar position as believers: not an earthly people but a heavenly people, though still on the earth.