When the head of a goat is severed from its body, the trunk struggles for some time, still showing signs of life. Similarly, though ahamkara (egotism) is slain in the perfect man, yet enough of its vitality is left to make him carry on the functions of physical life; but it is not sufficient to bind him again into the world.
As the snake is separate from its slough, even so is the Spirit separate from the body.
Disease is the tax which the soul pays for the body, as the tenant pays house-rent for the use of the house.