“They Who are the Luminaries of Truth and the Mirrors reflecting the light of Divine Unity,” Bahá’u’lláh explains in the Kitáb-i-Íqán, “in whatever age and cycle they are sent down from their invisible habitations of ancient glory unto this world to educate the souls of men and endue with grace all created things, are invariably endowed with an all-compelling power and invested with invincible sovereignty... These sanctified Mirrors, these Day-Springs of ancient glory are one and all the exponents on earth of Him Who is the central Orb of the universe, its essence and ultimate purpose. From Him proceed their knowledge and power; from Him is derived their sovereignty. The beauty of their countenance is but a reflection of His image, and their revelation a sign of His deathless glory... Through them is transmitted a grace that is infinite, and by them is revealed the light that can never fade... Human tongue can never befittingly sing their praise, and human speech can never unfold their mystery.” “Inasmuch as these Birds of the celestial Throne,” He adds, “are all sent down from the heaven of the Will of God, and as they all arise to proclaim His irresistible Faith, they therefore are regarded as one soul and the same person... They all abide in the same tabernacle, soar in the same heaven, are seated upon the same throne, utter the same speech, and proclaim the same Faith... They only differ in the intensity of their revelation and the comparative potency of their light... That a certain attribute of God hath not been outwardly manifested by these Essences of Detachment doth in no wise imply that they Who are the Day-Springs of God’s attributes and the Treasuries of His holy names did not actually possess it.”