God's eternal plan is a central theme explored in this episode. Paul reveals in Ephesians 3 that God foreordained a plan to save all of humanity through Jesus Christ. Like the mystery religions familiar to Greeks and Romans, this plan was hidden for ages but has now been fully disclosed. This “fellowship of the mystery” unifies all people, Jews and Gentiles alike, into one church. The church plays a critical role in revealing God’s eternal plan to both human and spiritual realms.

Paul highlights the principalities and powers in the heavenly places. This refers to angelic and demonic beings, which exist in spiritual hierarchies. Even angels, who are in God’s presence, did not fully understand His plan until it was revealed through apostles, prophets, and the church. For example, Peter notes in 1 Peter 1:10-12 that angels longed to comprehend God’s purpose. However, they, like humans, observe and learn from God's revelation. Satan and his demons also lacked complete understanding. Paul states in 1 Corinthians 2:7-8 that if they had understood, they would not have influenced the crucifixion of Christ.

This eternal plan also offers encouragement. Paul assures the Ephesians that, through faith in Jesus, Christians have unprecedented boldness and access to God. Inspired by this privilege, Paul prays for the Ephesians to be strengthened by the Holy Spirit, to resist the struggles presented by both human and spiritual opposition, and to allow Christ to dwell in their hearts through faith. This faith is the victory that overcomes the world (1 John 5:4). Thus, Paul encourages the Ephesians to boldly trust God’s eternal plan, knowing it leads them to salvation and victory over the forces of evil.