John 17:8 (KJV)
For I have given unto them the words which thou gavest me; and they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me.
Jesus used the words God had given him to explain to the disciples who he was and where he came from, Jesus new that the disciples understood where he came from and that God did send him.
The disciples sat at Jesus feet and heard every word that Jesus spoke. Today Christians do not have the opportunity to hear Jesus directly. But we can read the actual words he spoke in the gospels. The written word can be as powerful as the spoken word. Through these words we can understand that Jesus came from God and that he was sent by God.
Help me to understand the Gospels. Giving me the wisdom to understand what is written about where you came from and who sent you. With this knowledge give me the courage to go forward and proclaim Jesus as the true son of God.
In Jesus name I pray.