Lecture by Swami Tattwamayananda. Patanjali has given us the knowledge to purify and refine the human mind. Mind functions at the level of experiences and reactions. The knowledge of Yoga was transmitted through a succession of teachers and disciples. There are seven major important commentaries in this line. Our mental tendencies, Samskaras, constitute our essential characteristics. The valid tools of knowledge in Yoga are direct perception, inference, and authoritative testimony. Wrong knowledge and imaginary knowledge can also constitute part of our character. Verses: I.5, I.6, I.7, I.8, I.9