Chapter XLVIII. Imlac Discourses on the Nature of the Soul
“WHAT reason, said the prince,can be given, why the Egyptians should thus expensively preserve those carcasses which some nations consume with fire, others lay to mingle with the earth, and all agree to remove from their sight, as soon as decent rites can be performed?” 
“The original of ancient customs, said Imlac, is commonly unknown; for the practice often continues when the cause has ceased; and concerning superstitious ceremonies it is vain to conjecture; for what reason did not dictate reason cannot explain. I have long believed that the practice of embalming arose only from tenderness to the remains of relations or friends, and to this opinion I am more inclined, because it seems impossible that this care should have been general: had all the dead been embalmed, their repositories must in time have been more spacious than the dwellings of the living. I suppose only the rich or honourable were secured from corruption, and the rest left to the course of nature. 
“But it is commonly supposed that the Egyptians believed the soul to live as long as the body continued undissolved, and therefore tried this method of eluding death.”
“Could the wise Egyptians, said Nekayah, think so grosly of the soul? If the soul could once survive its separation, what could it afterwards receive or suffer from the body?
“The Egyptians would doubtless think erroneously, said the astronomer, in the darkness of heathenism, and the first dawn of philosophy. The nature of the soul is still disputed amidst all our opportunities of clearer knowledge: some yet say, that it may be material, who, nevertheless, believe it to be immortal.” 
“Some, answered Imlac, have indeed said that the soul is material, but I can scarcely believe that any man has thought it, who knew how to think; for all the conclusions of reason enforce the immateriality of mind, and all the notices of sense and investigations of science concur to prove the unconsciousness of matter.
“It was never supposed that cogitation is inherent in matter, or that every particle is a thinking being. Yet, if any part of matter be devoid of thought, what part can we suppose to think? Matter can differ from matter only in form, density, bulk, motion, and direction of motion: to which of these, however varied or combined, can consciousness be annexed? To be round or square, to  be solid or fluid, to be great or little, to be moved slowly or swiftly one way or another, are modes of material existence, all equally alien from the nature of cogitation. If matter be once without thought, it can only be made to think by some new modification, but all the modifications which it can admit are equally unconnected with cogitative powers.”
“But the materialists, said the astronomer, urge that matter may have qualities with which we are unacquainted.”
“He who will determine, returned Imlac, against that which he knows, because there may be something which he knows not; he that can set hypothetical possibility against acknowledged certainty, is not  to be admitted among reasonable beings. All that we know of matter is, that matter is inert, senseless and lifeless; and if this conviction cannot be opposed but by referring us to something that we know not, we have all the evidence that human intellect can admit. If that which is known may be over ruled by that which is unknown, no being, not omniscient, can arrive at certainty.”
“Yet let us not, said the astronomer, too arrogantly limit the Creator’s power.”
“It is no limitation of omnipotence, replied the poet, to suppose that one thing is not consistent with another, that the same proposition cannot be at once true and false, that the same number cannot be even and odd, that cogitation  cannot be conferred on that which is created incapable of cogitation.”
“I know not, said Nekayah, any great use of this question. Does that immateriality, which, in my opinion, you have sufficiently proved, necessarily include eternal duration?”
“Of immateriality, said Imlac, our ideas are negative, and therefore obscure. Immateriality seems, to imply a natural power of perpetual duration as a consequence of exemption from all causes of decay: whatever perishes is destroyed by the solution of its contexture, and separation of its parts; nor can we conceive how that which has no parts, and therefore admits no solution, can be naturally corrupted or impaired.” 
“I know not, said Rasselas, how to conceive any thing without extension: what is extended must have parts, and you allow, that whatever has parts may be destroyed.”
“Consider your own conceptions, replied Imlac, and the difficulty will be less. You will find subtance without extension. An ideal form is no less real than material bulk: yet an ideal form has no extension. It is no less certain, when you think on a pyramid, that your mind posseses the idea of a pyramid, than that the pyramid itself is standing. What space does the idea of a pyramid occupy more than the idea of a grain of corn? or how can either idea suffer laceration? As is the effect such is the cause; as  thought is, such is the power that thinks; a power impassive and indiscerpible.”
“But the Being, said Nekayah, whom I fear to name, the Being which made the soul, can destroy it.”
“He, surely, can destroy it, answered Imlac, since, however unperishable, it receives from a superiour nature its power of duration. That it will not perish by any inherent cause of decay, or principle of corruption, may be shown by philosophy; but philosophy can tell no more. That it will not be annihilated by him that made it, we must humbly learn from higher authority.”
The whole assembly stood a while silent and collected. “Let us return, said Rasselas, from this scene of mortality.  How gloomy would be these mansions of the dead to him who did not know that he shall never die; that what now acts shall continue its agency, and what now thinks shall think on for ever. Those that lie here stretched before us, the wise and the powerful of antient times, warn us to remember the shortness of our present state: they were, perhaps, snatched away while they were busy, like us, in the choice of life.”
“To me, said the princess, the choice of life is become less important; I hope hereafter to think only on the choice of eternity.”
They then hastened out of the caverns, and, under the protection of their guard, returned to Cairo.