If after this it be asked, What is the end of nature? We shall reply that on this head we are ignorant; that it is more than probable no man will ever fathom the secret; but we shall also say, it is evidently to exist, to act, to conserve her whole. If then it be demanded, Wherefore she exists? We shall again reply, of this we know nothing at present, possibly never shall; but we shall also say, she exists necessarily, that her operations, her motion, her phenomena, are the necessary consequences of her necessary existence. There necessarily exists something; this is nature or the universe, this nature necessarily acts as she does. If it be wished to substitute any other word for nature, the question will still remain as it did, as to the cause of her existence; the end she has in view. It is not by changing of terms that a geometrician can solve problems; one word will throw no more light on a subject than another, unless that word carries a certain degree of conviction in the ideas which it generates. As long as we speak of matter, if we cannot develope all its properties, we shall at least have fixed, determinate ideas; something tangible, of which we have a slight knowledge, that we can submit to the examination of our senses: but from the moment we begin to talk of immateriality, of incorporeity, from thence our ideas become confused; we are lost in a labyrinth of conjecture--we have no one means of seizing the subject on any side--we are, after the most elaborate arguments, after the most subtle reasoning, obliged to acknowledge we cannot form the most slender opinion respecting it, that has any thing substantive for its support. In short, that it is precisely that thing "of which every thing may be denied, but of which nothing can with truth be affirmed." Let us clothe this incomprehensible being with whatever qualities we may, it will be always in ourselves we seek the model; they will be our own faculties that we delineate, our own passions that we describe. In like manner man, as long as he is ignorant, will always conjecture that it is for himself alone the universe was formed; not withstanding, he has nothing more to do, than to open his eyes in order to be undeceived. He will then see, that he undergoes a common destiny, equally partakes with all other beings of the benefits, shares with them without exception the evils of life; like them he is submitted to an imperious necessity, inexorable in its decrees; which is itself nothing more than the sum total of those laws which nature herself is obliged to follow.