7. Anima received its name from the heathen, for the reason that it is wind (ventus). Wind is called in the Greek ἄνεμος; and we seem to live by drawing air into the mouth. But this is most clearly false, because anima comes into being long before air can be received into the mouth, because it is already alive in the womb of the mother.
8. Anima therefore is not air, as certain have thought who have not been able to form a conception of an incorporeal nature.
9. The evangelist asserts that spiritus is the same thing as anima, saying: “Potestatem habeo ponendi animam meam et rursus potestatem habeo sumendi eam.” And in regard to the anima of the Lord at the time of the passion, the same evangelist thus spoke, saying: “et inclinato capite emisit spiritum.”
10. For what is it to send forth the spiritus, if not to lay down the anima. But the anima is so called because it lives, and the spiritus because of its spiritual nature, or because it breathes (inspiret) in the body.
11. Likewise animus is the same as anima. But anima is of life, animus of wisdom. Whence the philosophers say that even without animus the life remains, and without the mind, anima endures....
12. ... It is not anima, but what excels in anima that is called mens, its head or eye, as it were. Whence man himself is called the image of God in respect to mens. However all those things are united to anima so that it is one thing. The anima has received different names according to the working of different causes.
13. ... When it gives life to the body, it is anima; when it wills,[328] it is animus; when it knows, it is mens; when it recollects, it is memoria; when it judges what is right, it is ratio; when it breathes, it is spiritus; when it is conscious of anything, it is sensus....
14. Corpus is so called because being corrupted, it perishes. For it is perishable and mortal and must sometime be dissolved.
16. The body is made up of the four elements. For earth is in the flesh; air in the breath; moisture in the blood; fire in the vital heat. For the elements have each their own part in us, and something is due them when the structure is broken up....
18. The bodily senses are five: sight, hearing, smell, taste, touch. Two of these open and close; two are always open.