The Book of Elements
Chapter 2
[ . . . ] One who is ruled by the animal soul will be ignorant, confused, daring, arrogant, eager to kill and to avenge himself, shedding blood, and sexually unrestricted. His character resembles that of beasts. One who is ruled by the appetitive, i.e., vegetative, soul will be stupid, dull, lacking in understanding, bent upon appetites…
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The Book of Definitions and Descriptions
Kitāb al-ḥudūd wa-’l-rusūm
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The Book of Fevers
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Kitāb fī l-rūḥ wa-’l-nafs, 1-3, 7-9, 15
The Book on Spirit and Soul and the Difference between the Two, compiled by Rabbi Isaac, the Son of Solomon, known as the Israelite, the Physician, may his Soul rest in Peace
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The Book of Substances
Kitāb al-jawāhir
[The light of “nature”] is the least bright and that farthest removed from spirituality, because it is at the farthest distance from the true light and pure brilliance, as it merely receives its light…
The Book of Urine
Kitāb al-bawl, Chapter 5
[As Hippocrates affirmed in his letters:] If the digestion increases, the urine necessarily diminishes; and vice versa, if the urine increases, the digestion must diminish. Urine [emitted]…
Admonition to the Physicians
Musar ha-rof’im, 1, 3, 5, 11, 13, 20-21, 30, 37-39, 47-48
1. Since it is the nature of living creatures to seek their sustenance and to concern themselves with those things that maintain their being; so, too, is man, whose image is the image of God…