Acts 1:8: Witnesses to the Ends of the Earth
Jesus answers a question about restored kingdoms with a promise of power and a commission to witness. The church's spread is his work through his people, not a timetable they control.
Acts 1:6–8: His Mission, Not Ours
The disciples wanted a timetable for restoring Israel's kingdom. Jesus gave them a mission instead, with the timing kept in the Father's hands.