Read the passage from the ancient Egyptian Book of the Dead.

Homage to thee, O my divine father Osiris! I come to embalm thee. Do thou embalm these my members, for I would not perish and come to an end [but would be] even like unto my divine father. . . . Let not my body become worms, but deliver thou me as thou didst deliver thyself. I pray thee, let me not fall into rottenness.

What is the central idea of this passage?