THIS world is a stage or market-place passed by pilgrims on their way to the next. It is here that they are to provide themselves with provisions for the way; or, to put it plainly, man acquires here, by the use of his bodily senses, some knowledge of the works of God, and, through them, of God Himself, the sight of whom will constitute his future beatitude. It is for the acquirement of this knowledge that the spirit of man has descended into this world of water and clay. As long as his senses remain with him he is said to be "in this world"; when they depart, and only his essential attributes remain, he is said to have gone to "the next world."
While man is in this world, two things are necessary for him: first, the protection and nurture of his soul; secondly, the care and nurture of his body. pg 49. Knowledge of the Next World