In Ephesians 3, Paul reveals the divine mystery that had been hidden for ages: God has one plan of salvation for all people through Christ. This revolutionary truth means that all believers—regardless of background—become fellow heirs, members of one body, and partakers of the same promise. This mystery wasn't discovered through human wisdom but was revealed by God Himself as part of His eternal purpose. Through Christ, we now have bold and confident access to God, transforming how we approach Him and enabling us to serve as living witnesses to this revealed mystery.