This is a reading of Chapter 1 of the Patanjali Yoga Sutras - Samadhi - translated by Alistair Shearer.

The Yoga Sutras of Patañjali is a collection of Sanskrit sutras (aphorisms) on the theory and practice of yoga. The Yoga Sutras was compiled in the early centuries CE, by the sage Patanjali in India who synthesized and organized knowledge about yoga from much older traditions. The Yoga Sutras is best known for its reference to ashtanga, eight elements of practice culminating in samadhi, and also incorporate action yoga (Kriya yoga).

The Yoga Sutras are a composite of various traditions. The Yoga Sutras built on Samkhya notions of purusha and prakriti, and is often seen as complementary to it. It is also closely related to Buddhism, incorporating some of its terminology such as the levels of samādhi which resemble the Buddhist jhanas.