First Source: The independence of the spirit from the body.

• FIRST SOURCE: This is subjective. That is to say, if anyone studies his own life and self, he perceives an immortal spirit. Indeed, in the course of occupying its body for a number of years the spirit causes the body to change considerably, yet the spirit self-evidently remains constant. In which case, although the body is ephemeral, it does not affect the spirit’s permanence, nor spoil its nature, even though the spirit is completely naked at death. However, in the course of life, the spirit gradually changes its body-clothes, and at the time of death, it is suddenly undressed. It has been established through certain conjecture, indeed, through observation, that the body subsists though the spirit; in which case, the spirit does not subsist through the body. Rather, since the spirit subsists and is dominant of itself, the body may be dispersed and gathered together again as it wishes; it will not infringe the spirit’s independence.

In fact, the body is the spirit’s house, it is its home; it is not its clothes. What clothes the spirit is a subtle, fine sheath, something which may be likened to a body, which is to some extent constant, and is ethereal and appropriate for the spirit. At the time of death, then, the spirit is not completely naked, it leaves its home dressed in its body-like sheath.

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Second Source: The proofs regarding the existence and immortality of the spirit from the external world.