The Samadhi-pada consists of 51 sutras that describe the nature of the mind and the means to dive deep into samadhi. The very definition, "Yogaścitta-vritti-nirodhaḥ" sets the highest goal. In nineteen lectures, the eminent academician and author, Prof. Madhusudan Penna, provides an elaborate introduction with explanation of every sutra, through the reading of Vyasa-bhashya.