The Patanjali Yoga Sutra is a foundational text on the philosophy and practice of yoga, emphasizing a process of spiritual insight that transcends ordinary perception. It is composed of four chapters that cover the aims of yoga, its practice, psychic powers, and liberation, each detailing various concepts, techniques, and obstacles related to achieving self-realization. The text underscores the importance of controlling the mind's fluctuations to attain a state of pure consciousness and connection with the cosmic self.