Isaiah 6: 1-8
Isaiah is overwhelmed by the majestic presence of God in the Temple.  But the holy God purges him and sends him to preach his message to an unjust society. 

1 Corinthians 15: 1-11
Despite his unworthiness, Paul in convinced that the risen Christ has called him to be an apostle. 

Luke 5: 1-11
Peter is afraid in the presence of Jesus, who brings about an amazing catch of fish.  Jesus calms his fears and sends him to catch people.