Avataric periods are like the springtide of creation. They bring a new release of power, a new awakening of consciousness, a new experience of life not merely for a few, but for all. Qualities of energy and awareness, which had been used and enjoyed by only a few advanced souls, are made available for all humanity. Life, as a whole, is stepped up to a higher level of consciousness, is geared to a new rate of energy. The transition from sensation to reason was one such step; the transition from reason to intuition will be another.
This new influx of the creative impulse manifests, through the medium of a divine personality, an incarnation of God in a special sense-the Avatar.
The Avatar was the first individual soul to emerge from the evolutionary and involutionary process as a Sadguru, and He is the only Avatar who has ever manifested or will ever manifest. Through Him God first completed the journey from unconscious divinity to conscious divinity, first unconsciously became man in order consciously to become God. Through Him, periodically, God consciously becomes man for the liberation of mankind.
-Discourses, 7th Ed, p268