The Hound of Heaven - Part A

Having understood Who the Holy Spirit is (Person not just power; Deity not just dignitary) we now find out what He does in the world of unbelieving people. Since the greatest gift God ever gave to the world was His only Son (John 3:16) it stands to reason that the greatest sin one can commit is to reject the Son (John 16:9). How does the Holy Spirit both sentence the world as prosecutor and lead people away from judgment? And what role do we play in all of this?