This claim is good if whatever is indestructible is immortal. But this is a manifest error. The elements of the human body are indestructible, but the body is not therefore immortal. It is subject to change, death, and decay. But if it is claimed that the soul, being immaterial, is without elements, then perhaps it might follow that it is indestructible; for that which is nothing can never be made less than nothing. But if the soul of man, being immaterial, is thus proved to be immortal, what shall we say of the souls of the lower orders of animals? for they manifest the phenomena of mind as well as men. They remember, fear, imagine, compare, manifest gratitude, anger, sorrow, desire, &c. Bishop Warburton says:-- “I think it may be strictly demonstrated that man has an immaterial soul; _but then_, the same arguments which prove _that_, prove, likewise, that the souls of all living animals are immaterial.” Whoever, therefore, affirms the immortality of man from the immateriality of his soul, is bound to affirm the same, not only of the nobler animals, but also of all the lower orders of the brute creation. Here, believers in natural immortality are crushed beneath the weight of their own arguments. If it be said that God can, if he choose, blot from existence the immaterial soul of the beetle and the titmouse, we reply, so can he that of man; and then its immortality is at an end, and the whole argument is abandoned. “_Matter cannot think._” This is the fundamental proposition on which the airy phantom of the immortality of the soul relies for its support. Since man does think, and matter cannot think, the mind or soul must be immaterial and immortal. It is one thing to make such an assertion; it is quite another thing to prove it; and the proof lies not within the power of man. That mind, like electricity, may be a property of matter, or result from material causes, Sidney Smith, in his Principles of Phrenology, 1838, very clearly states as follows:--