Jesus demonstrated the power of God by working miracles. He changed water into wine. He healed the sick. He cleansed the leper. He opened blinded eyes. He stilled the storm. He even raised the dead from the grave.
And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written...John 21:25
Purpose of Miracles
One clear purpose of miracles was to
authenticate the character of Jesus and his relationship with his heavenly Father. In this regard, miracles demonstrate the following: God is with Jesus (John 3:2); Jesus is from God (John 3:2; 9:342-33); God has sent Jesus (John 5:36); Jesus has authority on earth to forgive sins (Mark 2:10-11; Matt. 9:6-7; Luke 5:24-25); Jesus is approved by God (Acts 2:22); the Father is in Jesus and Jesus is in the Father (John 10:37-38; 14:11); in Jesus the kingdom of God has come (Matt. 12:28; Luke 11:20); and Jesus is the Messiah (Matt. 11:1-6; Luke 7:18-23) and the Son of God (Matt. 14:25-33).