1) Miracles occurred at key points in biblical history like Creation, Moses, and Jesus to confirm divine messages and revelations. 2) Miracles interrupt natural processes and events through immediate and complete healings or other supernatural occurrences. 3) Signs, wonders, and miracles authenticated Jesus and the apostles' messages, but there are no longer apostles or the "baptism with the Holy Spirit" to transmit miraculous powers today. God's revelation is complete so no further confirmation through miracles is needed.