It is impossible for man to present his body a living sacrifice, holy, and acceptable to God, while, because it is customary for the world to do so, he is indulging in habits that are lessening physical, mental, and moral vigor. The apostle adds: “And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.” Romans 12:2L. Jesus, seated upon the Mount of Olives, gave instruction to His disciples concerning the signs which should precede His coming. He said: “But as the days of Noah were, so shall also the coming of the Son of man be. For as in the days that were before the Flood they were eating and drinking, marrying and giving in marriage, until the day that Noah entered into the ark, and knew not until the Flood came, and took them all away; so shall also the coming of the Son of man be.” Matthew 24:37-39L.