Patanjali, the ancient sage, articulated the classical system of yoga perhaps more succinctly than anyone. Born before 400 B.C., Patanjali compiled a set of roughly two hundred aphorisms that explained the entire process of yoga from start to finish.
These aphorisms have influenced and inspired generation after generation of genuine seekers, each one of whom must eventually has to grapple with the terse sincerity of these statements.
The Yoga Sutras describe most importantly the process of yoga found within the school of Raja yoga. For a description of the other three traditional schools of yoga — karma yoga, bakti yoga, and jnana yoga — visit my article on them here.
The Yoga Sutras outline the process of yoga as a gradual process of refinement of the body and mind. Patanjali enumerates the process of Yoga into eight steps, often referred to as limbs, which are the following: