The Spirits' Book
Book Three - Moral Laws
Chapter V - IV. Law of Preservation
Voluntary Deprivations – Mortifications
723. Does the consumption of animal flesh by human beings contradict natural law?
“With your physical makeup, flesh nourishes flesh, and without this kind of sustenance human strength declines. The law of self-preservation requires humans to keep up their strength and health to fulfill the law of labor. They should, therefore, eat according to the requirements of their bodies.”