  The two most influential works of the Buddhist logico-epistemological tradition are Dignāga’s Collection on Valid Cognition (Pramāṇasamuccaya; hereafter PS) and Dharmakīrti’s Commentary on Valid Cognition (Pramāṇavārttika; hereafter PV). Dharmakīrti’s work, essentially a commentary on Dignāga’s, is to be singled out as one of the most outstanding contributions to Indian Buddhist thought, presenting a definite account of what later generations of philosophers in India took to be the normative Buddhist view. Dharmakīrti influenced the views of later Buddhist philosophers such as Śāntarakṣita (725–783), Kamalaśīla (740–795), Jñānagarbha (8th century), Dharmottara (750–810), Jñānaśrīmitra (ca. 975–1050), Ratnakīrti (11th century) Ratnākaraśānti (11–12th century) and Mokṣakaragupta (1150–1202).