Whose Son Is He?

How is it that those who haven't been given eyes to see Christ see only fleshly things? Why was Saul not among those that ran after the victorious David? Why was Saul so angry with David? What is the joy of the redeemed that Christ gives His own? What lineage was David from and what lineage was Saul from? Why do people debate the question of whose Son Christ was, His lineage? Why do the religious seek Christ, for what reason?