And God blessed them, saying,
Be fruitful, and multiply, and fill the waters in the seas, and let fowl multiply in the earth.
All Commentaries on Genesis 1:22 Go To Genesis 1
Gregory of Nyssa
Those who would contend that the soul migrates into natures divergent from each other seem to me to obliterate all natural distinctions—to blend and confuse together in every possible respect the rational, the irrational, the sentient and the insensate; if, that is, all these are to pass into each other with no distinct natural order secluding them from mutual transition. To say that one and the same soul, on account of a particular environment of body, is at one time a rational and intellectual soul, and that then it is caverned along with the reptiles, or herds with the birds, or is a beast of burden, or a carnivorous one, or swims in the deep; or even drops down to an insensate thing so as to strike out roots or become a complete tree, producing buds on branches, and from those buds a flower, or a thorn, or a fruit edible or noxious—to say this is nothing short of making all things the same and believing that one single nature runs through all beings; that there is a connection between them which blends and confuses hopelessly all the marks by which one could be distinguished from another. .