Forgetting what lies behind

Not long ago, I bumped into a man a bit younger than me who had taken a course from me as an older student.  It turned out that he was now terminally ill.  He felt he had tremendous regrets in life, that he had not done the things he should have done.  We talked about Paul - who had once been known as Saul, a very evil man - and who certainly had much to regret, but who was determined to not look at what lies behind.