Let us then conclude, that man has no just, no solid reason to believe himself a privileged being in Nature; because he is subject to the same vicissitudes, as all her other productions. His pretended prerogatives have their foundation in error, arising from mistaken opinions concerning his existence. Let him but elevate himself by his thoughts above the globe he inhabits, he will look upon his own species with the same eyes he does all other beings in Nature: He will then clearly perceive that in the same manner that each tree produces its fruit, by reason of its energies, in consequence of its species: so each man acts by reason of his particular energy; that he produces fruit, actions, works, equally necessary: he will feel that the illusion which he anticipates in favour of himself, arises from his being, at one and the same time, a spectator and a part of the universe. He will acknowledge, that the idea of excellence which he attaches to his being, has no other foundation than his own peculiar interest; than the predilection he has in favour of himself--that the doctrine he has broached with such seeming confidence, bottoms itself on a very suspicious foundation, namely IGNORANCE and SELF-LOVE. CHAP. VII. _The Soul and the Spiritual System_. Man, after having gratuitously supposed himself composed of two distinct independent substances, that have no common properties, relatively with each other; has pretended, as we have seen, that that which actuated him interiorly, that motion which is invisible, that impulse which is placed within himself, is essentially different from those which act exteriorly. The first he designated, as we have already said, by the name of a SPIRIT or a SOUL. If however it be asked, what is a spirit? The moderns will reply, that the whole fruit of their metaphysical researches is limited to learning that this motive-power, which they state to be the spring of man's action, is a substance of an unknown nature; so simple, so indivisible, so deprived of extent, so invisible, so impossible to be discovered by the senses, that its parts cannot be separated, even by abstraction or thought. The question then arises, how can we conceive such a substance, which is only the negation of every thing of which we have a knowledge? How form to ourselves an idea of a substance, void of extent, yet acting on our senses; that is to say, on those organs which are material, which have extent? How can a being without extent be moveable; how put matter in action? How can a substance devoid of parts, correspond successively with different parts of space? But a very cogent question presents itself on this occasion: if this distinct substance that is said to form one of the component parts of man, be really what it is reported, and if it be not, it is not what it is described; if it be unknown, if it be not pervious to the senses; if it be invisible, by what means did the metaphysicians