In the ministry of Paul and Barnabas, particularly during their missionary journeys as recorded in the Book of Acts, it is clear that God demonstrated His presence and approval through various means. The most notable among these is that God performed miracles through Paul and Barnabas.
These miracles served not only as a demonstration of God's power but also as a sign that affirmed the message they were preaching about Jesus Christ. Instances of healing and other miraculous acts are recorded, showing that their ministry was accompanied by divine intervention, which validated their mission in the eyes of the people and the early church.
While the other points mentioned reflect various aspects of their journey and ministry, such as perseverance, travel safety, and the involvement of John Mark, the miraculous acts stand out as a direct demonstration of God's active presence and approval in their work.