The men of science of today have admitted the fact that the whole skin of man is changed in so many years and they have also been able to discover that each atom of man's constitution changes so many times in life, renewing his body each time. If the body is subject to change, so is the mind, and it is only by these that man's person is identified. Again, in our food and drink we live upon so many small lives and so many small lives live upon us, dwelling in our blood, veins, tubes, and in the skin, all of which constitute our individuality. And in the mind our every thought and feeling is as alive as we, even such beings as the elementals, demons, and angels, which are created within us, from us, and of us, and yet may as fitly be called individuals as we. So in the end of the examination it is hard for a man to find out whether he exists as one or many.