Luke 5:4-11 NIV
4 When he had finished speaking, he said to Simon, “Put out into deep water, and let down the nets for a catch.”
5 Simon answered, “Master, we’ve worked hard all night and haven’t caught anything. But because you say so, I will let down the nets.”
6 When they had done so, they caught such a large number of fish that their nets began to break. 7 So they signalled their partners in the other boat to come and help them, and they came and filled both boats so full that they began to sink.
8 When Simon Peter saw this, he fell at Jesus’ knees and said, “Go away from me, Lord; I am a sinful man!” 9 For he and all his companions were astonished at the catch of fish they had taken, 10 and so were James and John, the sons of Zebedee, Simon’s partners.
Then Jesus said to Simon, “Don’t be afraid; from now on you will fish for people.” 11 So they pulled their boats up on shore, left everything and followed him.

So often when God reveals himself, whether that be through a burning bush, an angel, or through the miraculous deeds of Jesus, the response is one of awe and fear, a realisation of how high he is and how low we are; ‘Go away from me Lord, I am a sinful man!’ It is right and proper for us to show such respect, who are we compared to God. But the response of God is always this, ‘do not be afraid.’ In his grace and love, God does not look down on us, but calls him to work with him, not as slaves but as friends, partners even.

Who am I that you have chosen me, yet chosen me you have!