Joseph, man of God, was chosen to be Jesus' human father. He didn't believe at first that Mary could be pregnant by God's design. He had to divorce her but planned to do it in a way that would make him the jerk in the story and spare Mary's life. Mary would be stoned to death if it were known that she cheated on Joseph. But if Joseph got her pregnant and then left her, he becomes the villain and Mary the victim. Here we see a glimpse of God's live through Joseph's action. In the pain of betrayal, he thinks not of himself but of his beloved, Mary.
The end of the story: an angel appeared to Joseph in a dream, confirming the information Mary had given him and they stay together as the birth of Jesus unfolds.
