Yoga is union.1

Yoga is nothing but practical psychology.2

…Religion sets an immeasurable gulf between the Power …worshipped and the worshipper.
Yoga in its culmination abolishes the gulf.3

Essentially, Yoga is a generic name for the processes and the result of processes by which we transcend or shred off our present modes of being and rise to a new, a higher, a wider mode of consciousness which is not that of the ordinary animal and intellectual man. Yoga is the exchange of an egoistic for a universal or cosmic consciousness lifted towards or informed by the supra-cosmic, transcendent Unnameable who is the source and support of all things. Yoga is the passage of the human thinking animal towards the God-consciousness from which he has descended.4

Nature seeks the Divine in her own symbols; Yoga goes beyond Nature to the Lord of Nature, beyond universe to the Transcendent and can return with the transcendent light and power, with the fiat of the Omnipotent.5

But what Nature aims at for the mass in a slow evolution, Yoga effects for the individual by a rapid revolution. It works by a quickening of all her energies, a sublimation of all her faculties.6

In the past it has been attempted by a drawing away from the world and a disappearance into the height of the Self or Spirit.7

…the contact of the human and individual consciousness with the divine is the very essence of Yoga. Yoga is the union of that which has become separated in the play of the universe with its own true self, origin and universality. The contact may take place at any point of the complex and intricately organised consciousness which we call our personality. It may be effected in the physical through the body; in the vital through the action of those functionings which determine the state and the experiences of our nervous being; through the mentality, whether by means of the emotional heart, the active will or the understanding mind, or more largely by a general conversion of the mental consciousness in all its activities. It may equally be accomplished through a direct awakening to the universal or transcendent Truth and Bliss by the conversion of the central ego in the mind. And according to the point of contact that we choose will be the type of the Yoga that we practise.8

Yoga is communion with God for knowledge, for love or for work.

The Yogin puts himself into direct relation with that which is omniscient and omnipotent within man and without him. He is in tune with the infinite, he becomes a channel for the strength of God to pour itself out upon the world whether through calm benevolence or active beneficence. When a man rises by putting from him the slough of self and lives for others and in the joys and sorrows of others; when he works perfectly and with love and zeal, but casts away the anxiety for results and is neither eager for victory nor afraid of defeat; when he devotes all his works to God and lays every thought, word and deed as an offering on the divine altar; when he gets rid of fear and hatred, repulsion and disgust and attachment, and works like the forces of Nature, unhasting, unresting, inevitably, perfectly; when he rises above the thought that he is the body or the heart or the mind or the sum of these and finds his own and true self; when he becomes aware of his immortality and the unreality of death; when he experiences the advent of knowledge and feels himself passive and the divine force working unresisted through his mind, his speech, his senses and all his organs; when having thus abandoned whatever he is, does or has to the Lord of all, the Lover and Helper of mankind, he dwells permanently in Him and becomes incapable of grief, disquiet or false excitement, that is Yoga. Pranayam and Asans, concentration, worship, ceremonies, religious practice are not themselves Yoga but only a means towards Yoga. Nor is Yoga a difficult or dangerous path, it is safe and easy to all who take refuge with the Inner Guide and Teacher. All men are potentially capable of it, for there is no man who has not strength or faith or love developed or latent in his nature, and any one of these is a sufficient staff for the Yogin. All cannot, indeed, reach in a single life the highest in this path, but all can go forward; and in proportion as a man advances he gets peace, strength and joy.9

References:

  1. The Synthesis of Yoga, Page: 552
  2. The Synthesis of Yoga, Page: 44
  3. The Synthesis of Yoga, Page: 552
  4. Essays in Philosophy and Yoga, Page: 117
  5. The Synthesis of Yoga, Page: 30
  6. The Synthesis of Yoga, Page: 29
  7. Autobiographical Notes, Page: 548
  8. The Synthesis of Yoga, Page: 32
  9. Essays in Philosophy and Yoga, Page: 11