cannot of themselves undergo any of these developments by chance, since they are capable of taking other forms. Thus, when we consider the particular form the human being has acquired, distinguishing him from other bodies, and the faculties and organs within him equipped to serve his welfare:

his hearing, sight, smell, touch, and organs of taste; the organs provided for his nourishment, without which he cannot survive, arranged according to his needs, so that, while he needs to suckle, he has no teeth that would impede his nourishment and come between him and his wet nurse; then, when he passes beyond that stage to food from which he can neither benefit nor obtain the nourishment he needs unless his teeth grind it for him, he is given as many teeth as he needs for that purpose; the stomach, equipped to cook and refine the food that reaches it until it can reach the hair, nails, and all the other organs through fine passageways prepared for this purpose, in quantities sufficient to sustain them; and the liver, equipped to warm it with heat reaching it from the heart,