[111] For God has implanted in the mind a power of comprehending that world, which is appreciable only by the intellect, by its own power, but the invisible world by means of the external senses. And if any one were able in all his parts to live to God rather than to himself, looking by means of the external senses into those things which are their proper objects, for the sake of finding out the truth; and through the medium of the soul, investigating in a philosophical spirit the proper objects of intelligence, and those things which have a real existence, and by means of his organs of voice, singing hymns in praise of the world and of its Creator, he will have a happy and a blessed life.