The Blessed Man's Seed

How were the seed of Christ chosen? Why do the children of God fear that somehow the LORD will cast them off? Why did Christ look on Peter with grace even after Peter denied Him three times? Could a man who was not God fulfill the Law of God? Is Christ depicted in some way in every single Scripture of the Old and New Testaments? Can the world see Christ if they go to a good enough Bible teaching school or does it take the eyes of the Spirit to reveal Him to His chosen ones?