Lecture by Swami Tattwamayananda. The higher aspiration of Yoga is to reach a state of Nirodha, complete freedom from obsessive likes and dislikes, Vrittis, of the mind. Before reaching that stage, several stages of concentration are classified: restlessness, dullness, swinging between extremes, and one-pointed. Kshina-Vrtti is a state when the mind’s vrittis have been weakened or transcended. The mind then attains a state of Yogic concentration, which is free. Verses: I.1, I.2, I.41