Paramahansa Yogananda: "What is Yoga?"
Paramahansa Yogananda, the well-known author of Autobiography of a Yogi, responds to the question "What is Yoga?" in the text The Essence of Self-Realization:
"Yoga means union. Etymologically, it is connected to the English word, yoke. Yoga means union with God, or, union of the little, ego-self with the divine Self, the infinite Spirit. Most people in the West, and also many in India, confuse Yoga with Hatha Yoga, the system of bodily postures.
But Yoga is primarily a spiritual discipline . I don't mean to belittle the Yoga postures. Hatha Yoga is a wonderful system. The body, moreover, is a part of our human nature, and must be kept fit lest it obstruct our spiritual efforts. Devotees, however, who are bent on finding God give less importance to the Yoga postures. Nor is it strictly necessary that they practice them. Hatha Yoga is the physical branch of Raja Yoga, the true science of Yoga. Raja Yoga is a system of meditation techniques that help to harmonize human consciousness with the divine consciousness.