John 6:2 amp

And a great crowd was following Him because they had seen the signs (miracles) which He (continually) performed upon those who were sick.

Jesus is still in the business of miracles and signs as He works on our behalf and the behalf of the unsaved.  The miracles that Jesus performed showed to the followers that God was real.  A great crowd following Jesus were hungry to see the loving hand of God stretched out to heal them.