Yoga (Sanskrit: योग) is the physical, mental, and spiritual practices or disciplines which originated in ancient India with a view to attain a state of permanent peace of mind in order to experience one’s true self.
The term yoga can be derived from either of two roots, yujir yoga (to yoke) or yuj samādhau (to concentrate). The Yoga Sūtras of Patañjali defines yoga as “the stilling of the changing states of the mind” (Sanskrit: योग: चित्त-वृत्ति निरोध:). Yoga has also been popularly defined as “union with the divine” in other contexts and traditions.
wikiquote / Yoga
As Sri Aurobindo says – The principle of Yoga is the turning of one or of all powers of our human existence into a means of reaching divine Being. or simply “All Life is Yoga“