The word Yoga is derived from the Sanskrit root yuj meaning to bind, join, attach and yoke, to direct and concentrate one's attention on, to use and apply. it also means union or communion. It is the true union of our will with the will of God. 'It thus means', says Mahadev Desai in his introduction to the Gita according to Gandhi, 'the yoking of all the power of body, mind and soul to God; it means the disciplining of the intellect, the mind, the emotions, the will, which that yoga presupposes; it means a poise of the soul which enables one to look at life in all its aspect evenly.'
(B.K.S. Iyengar, Light on Yoga)