I would try to change all of our hearts by removing greed, arrogance and selfishness from our heart and mind. The voice that speaks to you is your conscience, and it's your only measure of honesty and your selfishness. If you no longer hear that voice or care then you have lost one of the greatest things God gave us all a conscience and you are already spiritually dead. Maybe if at the end of a week of feeling and seen other by having empathy and compassion for others positions they were born into thought-out the world. You just might be able to get back what you lost over years because of your greed, your arrogance and your selfishness. kentay