This fourth and final Science and Philosophy in the Indian Buddhist Classics volume provides, through extensive passages, a window into the works of the great thinkers from the flowering of philosophy in classical India. This is the second philosophy volume in the Science and Philosophy series. Whereas the first philosophy volume presented the views of the non-Buddhist and Buddhist schools in sequence, the present work selects specific topics for consideration, including the nature of the two truths, the analysis of self, the Yogacara explanation of reality, emptiness in the Madhyamaka tradition, a survey of logic and epistemology, and the Buddhist explanation of language and meaning. Like earlier volumes, it provides, through extensive extracts, a window into the works of the masters of the Nalanda tradition. The final section on language is particularly unique and largely crafted by Thupten Jinpa.