Education
Part two of verse 18 identifies the object God used to guide the diaspora into salvation. Jesus said, "The truth shall set you free" and God used a message of truth concerning who He is and the condition man finds himself in when in his natural state. Through educating humanity with a message of truth (Jesus' lived out testimony of God and man on earth), God's plan is revealed to include clarification concerning who He is and man's purpose in having been created.