 Al-Rāzī’s views on medical epistemology are also Galenic, and presuppose that the best doctor should understand the human body at a theoretical level while also drawing on a wealth of experience (Pormann 2008). This provides a methodological context for understanding the aforementioned Comprehensive Book, which as mentioned collects book-learning on medical theory, but uses al-Rāzī’s own empirical observations to confirm or disconfirm those theories.