Tsong khapa (14th-15th centuries) is arguably the most important and influential philosopher in Tibetan history. His Ocean of Reasoning is the most extensive and perhaps the deepest extant commentary on N=ag=arjuna's M?lamadhyamakak=arik=a (Fundamental Wisdom of the Middle Way), and it can be argued that it is impossible to discuss N=ag=arjuna's work in an informed way without consulting it. It discusses alternative readings of the text and prior commentaries and provides a detailed exegesis, constituting a systematic presentation of Madhyamaka Buddhist philosophy. Despite...