Mistakes are common- rarely are they deadly.--Spiritual mistakes are common- if left or ignored, these can, indeed, become deadly. But what does it profit a man if he gains the world but loses his soul---Hebrews 12-1-3 connects suffering to endurance to glory. Why- What benefit is it to us to know why---One reason is, knowing how suffering and glory are connected prevents us from making several common spiritual mistakes that are costing far too many people joy in this life, and reward in the next.