I suspect that Mr. Arnold 'learned' all the things that you have 'assumed'.  Those of us with imperfections make mistakes that we knew were wrong at the time in an academic fashion at least; actually being chastised for being imperfect, however, brings personal focus to those poor decisions.   That is what I see from 'a lessons learned' summation.  If, you are without sin and never make any mistakes, you never have that 'lessons learned' experience.  Such sainthood is seldom found in our society.  I certainly don't have it and I doubt that you do.