Nature then produces nothing but what is necessary; it is not by fortuitous combinations, by chance throws, that she exhibits to our view the beings we behold; all her throws are sure, all the causes she employs have infallibly their effects. Whenever she gives birth to extraordinary, marvellous, rare beings, it is, that the requisite order of things the concurrence of the necessary productive causes, happens but seldom. As soon as those beings exist, they are to be ascribed to nature, equally with the most familiar of her productions; to nature every thing is equally possible, equally facile, when she assembles together the instruments or the causes necessary to act. Thus it seems presumption in man to set limits to the powers of nature, which he so very imperfectly understands. The combinations, or if they will, the throws that she makes in an eternity of existence, can easily produce all the beings that have existed: her eternal march must necessarily bring forth, again and again, the most astonishing circumstances; the most rare occurrences; those most calculated to rouse the wonder, to elicit the admiration of beings, who are only in a condition to give them a momentary consideration; who can get nothing more than a glimpse, without ever having either the leisure or the means to search into causes, which lie hid from their weak eyes, in the depths of Cimmerian obscurity. Countless throws during eternity, with elements and combinations varied almost to infinity, quite with relation to man, suffice to produce every thing of which he has a knowledge, with multitudes of other effects, of which he will never have the least conception.