"The doctrine of spirituality, such as it now exists, offers nothing but vague ideas, or, rather, is the absence of all ideas. What does it present to the mind but a substance which possesses nothing of which our senses enable us to have a knowledge? Can it be truth, that man is able to figure to himself a being not material, having neither extent nor parts; which, nevertheless, acts upon matter without having any point of contact, any kind of analogy with it; and which itself receives the impulse of matter by means of material organs, which announce to it the presence of other beings? Is it possible to conceive the union of the soul with the body; to comprehend how this material body can bind, enclose, constrain, determine a fugitive being, which escapes all our senses? Is it honest, is it plain dealing, to solve these difficulties, by saying there is a mystery in them, that they are the effects of a power more inconceivable than the human soul, than its mode of acting, however concealed from our view? When to resolve these problems, man is obliged to have recourse to miracles, to make the Divinity interfere, does he not avow his own ignorance? When notwithstanding the ignorance he is thus obliged to avow by availing himself of the divine agency, he tells us, this immaterial substance, this soul, shall experience the action of the element of fire, which he allows to be material; when he confidently says, this soul shall be burnt; shall suffer in purgatory--have we not a right to believe, that either he has a design to deceive us, or else that he does not himself understand that which he is so anxious we shall take upon his word?" The ninth chapter, after treating of the diversity of the intellectual faculties, proceeds, "Man at his birth brings with him into the world nothing but the necessity of conserving himself, of rendering his existence happy; instruction, examples, the custom of the world, present him with the means, either real or imaginary, of achieving it; habit procures for him the facility of employing these means:"--