Philosophical Letters (Book of Spiritual Medicine, Book of Philosophical Biography)

This book includes two books: the book "Spiritual Medicine" and the book "Philosophical Biography", and two articles "An Treatise on Beyond Nature" and "An Treatise on the Emirates of Iqbal and the State", written by Abu Bakr Muhammad bin Zakaria al-Razi (250 AH/864 AD). A Muslim physician, philosopher, and mathematician, one of the scholars of the golden age of science.
Al-Razi's humility and austerity over the course of his life is clear to us from his words in the book "The Philosophical Biography," where he says: "I did not appear to be evil in amassing money and wasting it, nor to people's disputes, quarrels, and injustice. Rather, what is known about me is against all of that and deprivation of many of my rights. As for my condition in my eating, drinking, and entertainment, those of me who often see this may know that I have not gone to the extreme of excess, and the same applies to all of my conditions that this person sees, whether I am dressed, riding, servant, or female."