90. Now as I like maxims which hold good and admit of the fewest exceptions possible, here is what has appeared to me most reasonable in every sense on this important question. I consider that souls and simple substances altogether cannot begin except by creation, or end except by annihilation. Moreover, as the formation of organic animate bodies appears explicable in the order of nature only when one assumes a _preformation_ already organic, I have thence inferred that what we call generation of an animal is only a transformation and augmentation. Thus, since the same body was already furnished with organs, it is to be supposed that it was already animate, and that it had the same soul: so I assume _vice versa_, from the conservation of the soul when once it is created, that the animal is also conserved, and that apparent death is only an envelopment, there being no likelihood that in the order of nature souls exist entirely separated from all body, or that what does not begin naturally can cease through natural forces. 91. Considering that so admirable an order and rules so general are established in regard to animals, it does not appear reasonable that man should be completely excluded from that order, and that everything in relation to his soul should come about in him by miracle. Besides I have pointed out repeatedly that it is of the essence of God's wisdom that all should be harmonious in his works, and that nature should be parallel with grace. It is thus my belief that those souls which one day shall be human souls, like those of other species, have been in the seed, and in the progenitors as far back as Adam, and have consequently existed since the beginning of things, always in a kind of organic body. On this point it seems that M. Swammerdam, Father Malebranche, M. Bayle, Mr. Pitcairne, M. Hartsoeker and numerous other very able persons share my opinion. This doctrine is also sufficiently confirmed by the microscope observations of M. Leeuwenhoek and other good observers. But it also for divers reasons appears likely to me that they existed then as sentient or animal [173] souls only, endowed with perception and feeling, and devoid of reason. Further I believe that they remained in this state up to the time of the generation of the man to whom they were to belong, but that then they received reason, whether there be a natural means of raising a sentient soul to the degree of a reasoning soul (a thing I find it difficult to imagine) or whether God may have given reason to this soul through some special operation, or (if you will) by a kind of _transcreation_. This latter is easier to admit, inasmuch as revelation teaches much about other forms of immediate operation by God upon our souls. This explanation appears to remove the obstacles that beset this matter in philosophy or theology. For the difficulty of the origin of forms thus disappears completely; and besides it is much more appropriate to divine justice to