On Rewards and Punishments (119-120)

The lawgiver says, then, that a perfect freedom from disease in every respect, both privately and generally, shall be allotted to those persons who labour in the service of virtue and who make the sacred laws the guides of all their speeches and actions in life; and if there should any infirmity affect them it will not be for the sake of injuring them, but with a view to remind a mortal that he is mortal, so as to eradicate overbearing pride and improve his disposition. And sound health will follow, and a good condition of the outward senses, and a perfectness and completeness in all the parts, conducive to the unimpeded performance of those duties for which each man has been born.

For God has thought fit to give as a reward to the virtuous a house thoroughly well built and well put together from the foundations to the roof; and the most natural house for the soul is the body, inasmuch as it does many things necessary and useful for life, and especially on account of the mind which has been purified by perfect purifications;