What Abdul'Baha Says...

This quickening spirit has spontaneous emanation from the Sun of Truth, from the reality of divinity and is not a revelation or a manifestation. It is like the rays of the sun. The rays are emanations from the sun. This does not mean that the sun has become divisible; that a part of the sun has come out into space. This plant beside me has risen from the seed; therefore it is a manifestation and unfoldment of the seed. The seed, as you can see, has unfolded in manifestation and the result is this plant. Every leaf of the plant is a part of the seed. But the reality of divinity is indivisible and each individual of human kind cannot be a part of it as is often claimed. Nay, rather, the individual realities of mankind when spiritually born are emanations from the reality of divinity, just as the flame, heat and light of the sun are the effulgence of the sun and not a part of the sun itself. Therefore a spirit has emanated from the reality of divinity, and its effulgences have become visible in human entities or realities. This ray and this heat are permanent. There is no cessation in the effulgence. As  262  long as the sun exists the heat and light will exist, and inasmuch as eternality is a property of divinity, this emanation is everlasting. There is no cessation in its outpouring. The more the world of humanity develops, the more the effulgences or emanations of divinity will become revealed, just as the stone when it becomes polished and pure as a mirror will reflect in fuller degree the glory and splendor of the sun.

(Abdu'l-Baha, Baha'i World Faith - Abdu'l-Baha Section, p. 261)