Man realizes he is not a god. He is a creature beset by limitations and weaknesses. Therefore, he has this concern about what happens to him when he passes this life. The Jews were sticklers for cleansing themselves although they underscored the externals only. I suppose that was not so in the beginning but more and more these cleansings were limited to superficial manifestations that Our dear Lord expressed disapproval of their so called piety because they honored the Lord only with their lips but their hearts were far away. The Lord in today’s Gospel tells us the real culprit for our dirtiness. That is sin.