The 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).
Lord, if it is you, command me to come to you on the water. Matthew 14:28

There is something almost impudent in Peter's telling Christ to bid him come to him walking on water. We wonder that Peter dared do it. But after he had taken a few steps and realized what he was doing, Peter's weak faith caught up with him. 

He began to doubt, and when that doubt took hold, he began to sink. We can understand how Peter felt, both the exaltation and the letdown. We, too, know what it means to falter in faith. But that should not keep us from striving to trust even more. Faith is demanding but only because its rewards are so great. It is the joyful living in an understanding of the Gospel's words" for with God nothing is impossible When the outlook is darkest, we need to exercise our faith. Christ is out there on the water calling, "Come." What a joy it will be for you and me and for Jesus if we press forward and do not let our doubts hold away. Then we, too, will" walk on the water" and not sink.

Lord, strengthen my faith that I may make you happy by trusting your power will sustain me, Amen.

Source: St -Takla.org