He had only to look into his heart to see that he was still impure. He knew because he still felt the guilt. Then one day, a great insight hit Luther. He could not have salvation until he believed himself saved. If he lacked this belief, it didn’t matter what the priest said or did. If he had this belief, it didn’t matter what the priest said or did. Which raised a big, big question: of what use was the priest? Why was he even in the mix?