And God blessed them, saying,
Be fruitful, and multiply, and fill the waters in the seas, and let fowl multiply in the earth.
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Ambrose of Milan
Seeds of one kind cannot be changed into another kind of plant nor bring forth produce differing from its own seeds, so that men should spring from serpents and flesh from teeth. How much more, indeed, is it to be believed that whatever has been sown rises again in its own nature and that crops do not differ from their seed, that soft things do not spring from hard nor hard from soft, nor is poison changed into blood, but that flesh is restored from flesh, bone from bone, blood from blood, the humors of the body from humors.