The ancient Hindu doctrine of concentration of mind embracing the mnemonic rules, called Yoga Sutras, of Patanjali and the comment, called Yoga Bhashya, attributed to Veda-Vyasa, and the explanation, called Tattva-Vaicaradi, of Vachaspati-Micra, translated from the original Sanskrit. The historical importance of these texts forms a bridge between the philosophy of ancient India and the fully developed Indian Buddhism and the religious thought of today in Eastern Asia.