Lecture by Swami Tattwamayananda. This lecture begins with a review of the chapter order of the yoga sutra classes. The world of Vrittis that constitute our mental world, keeps us in a cycle of activities and tendencies. Yoga helps us to break the cycle and evolve. The first step is to use actions, Kriya Yoga, to generate good tendencies. To break the cycle, the root ignorance of our nature must be removed through continuous practice of discerning wisdom, Viveka-Khyati. Ethics, Yamas, and Niyamas are the foundation for the practice of higher concentration. The lecture ends with a brief introduction to the eighteenth sutra, which tells the method of reaching higher concentration. Verses: I.1, I.2, II.15, II.29, II.30, II.32, I.18.