Moses may have developed a low self-image having had to run from Egypt in a powerful position to that of a lowly shepherd caring for flock that were not his own in a strange land. He most certainly would have shown humility having witnessed the burning bush and the angel of the Lord speaking to him. He also shows lack of faith by questioning God. God reassures him by telling him that he would be with him. God promised us that he would never leave nor forsake us as well.