Ocean of Reasoning: A Great Commentary on N=ag=arjuna's Mūlamadhyamakak=arik=aTsong kha pa (14th century) is arguably the most important and influential philosopher in Tibetan history. An Ocean of Reasoning is the most extensive and perhaps the deepest extant commentary on Nagarjuna's Mulamadhyamakakarika (Fundamental Wisdom of the Middle Way), and it can be argued that it is impossible to discuss Nagarjuna's work in an informed way without consulting it. It discusses alternative readings of the text and prior commentaries and