Literally, yoga means “union.” When you are in yoga, it means that in your experience, everything has become one. This is the essence of the science. This is also its deepest aim.

Another meaning of the word yoga is “to tie the strands of the mind together.

Yoga is the union of that which has become separated in the play of the universe with its own true self, origin and universality.

Yoga, an ancient but perfect science, deals with the evolution of humanity. This evolution includes all aspects of one's being, from bodily health to self-realization. Yoga means union — the union of body with consciousness and consciousness with the soul. Yoga cultivates the ways of maintaining a balanced attitude in day-to-day life and endows skill in the performance of one's actions.

The word ‘yoga’ literally means ‘union’. When you experience everything as one in your consciousness, then you are in yoga. -Sadhguru

Yoga, as it was understood by its sages, is designed to satisfy all the human needs in a comprehensive, seamless whole. Its goal is nothing less than to attain the integrity of oneness — oneness with ourselves and as a consequence oneness with all that lies beyond ourselves. We become the harmonious microcosm in the universal microcosm. Oneness, what I call integration, is the foundation for wholeness, inner peace, and ultimate freedom.

Sexual yoga needs to be freed from a misunderstanding attached to all forms of yoga, of spiritual 'practice' or 'exercise,' since these ill-chosen words suggest that yoga is a method for the progressive achievement of certain results - and this is exactly what it's not. Yoga means 'union,' that is, the realization of on man's inner identity with Brahman or Tao, and strictly speaking this is not an end to which there are methods or means since it cannot be made an object of desire. The attempt to achieve it invariably thrusts it away.

Properly speaking, Yoga is an adjunct to religion and has always been treated as such in India, the country of its birth. The word Yoga is derived from the Sanskrit root yuj which means to yoke or join. As such, Yoga signifies the union of the individual soul with universal Consciousness or, in the language of the Upanishads, with the uncreated, all-pervading Brahman.

Yoga is the cessation of movements of the mind. Then there is abiding in the seer's own form.

Yoga is the science that teaches you the method of uniting the individual will with the Cosmic Will. Yoga transmutes the unregenerate nature and increases energy, vitality, vigour, and bestows longevity and a high standard of health. Try to increase the power of concentration. Japa will help you to have a one-pointed mind. (What Is Actual Yoga)

The way of yoga followed here has a different purpose from others, — for its aim is not only to rise out of the ordinary ignorant world-consciousness into the divine consciousness, but to bring the supramental power of that divine consciousness down into the ignorance of mind, life and body, to transform them, to manifest the Divine here and create a divine life in Matter.

Yoga is skill in action.

The fundamental text of the Hindu tradition is, of course, the Bhagavad Gītā; and there four basic yogas are described. The word yoga itself, from a Sanskrit verbal root yuj, meaning “to yoke, to link one thing to another,” refers to the act of linking the mind to the source of mind, consciousness to the source of consciousness; the import of which definition is perhaps best illustrated in the discipline known as knowledge yoga, the yoga, that is to say, of discrimination between the knower and the known, between the subject and the object in every act of knowing, and the identification of oneself, then, with the subject. “I know my body. My body is the object. I am the witness, the knower of the object. I, therefore, am not my body.” Next: “I know my thoughts; I am not my thoughts.” And so on: “I know my feelings; I am not my feelings.” You can back yourself out of the room that way. And the Buddha then comes along and adds: “You are not the witness either. There is no witness.” So where are you now? Where are you between two thoughts? That is the way known as jñāna yoga, the way of sheer knowledge.

Yoga is, as I can readily believe, the perfect and appropriate method of fusing body and mind together so that they form a unity which is scarcely to be questioned. This unity creates a psychological disposition which makes possible intuitions that transcend consciousness.