There is a popular expression that says "seeing is believing." However, many people saw the amazing signs performed by Jesus and did not believe in him. In two separate incidents recorded in John 4:43-5:18, Jesus performed signs of healing, but few believed in him. One politically connected man did believe while the religious leaders did not. He became a model of faith, while they became a warning about the dangers of man-made religion. (full sermon notes)
At the Red Sea, the LORD triumphed gloriously, made himself known, and anticipated his greater triumph in the cross and resurrection.
The Thessalonian believers followed the good example of their faithful ministers.
In some of his last words, in Matthew 28:16-20, Jesus gave a clear mission to his disciples: to make more disciples of all people...