"The sign of the invisible heaven must needs be revealed in the person of that perfect man who, before each Manifestation appeareth, educateth, and prepareth the souls of men for the advent of the divine Luminary ..."

 

Degas

"From all that We have stated it hath become clear and manifest that before the revelation of each of the Mirrors reflecting the divine Essence, the signs heralding their advent must needs be revealed in the visible heaven as well as in the invisible, wherein is the seat of the sun of knowledge, of the moon of wisdom, and of the stars of understanding and utterance. The sign of the invisible heaven must needs be revealed in the person of that perfect man who, before each Manifestation appeareth, educateth, and prepareth the souls of men for the advent of the divine Luminary, the Light of the unity of God amongst men."

~Bahá'u'lláh

(The Kitáb-i-Íqán)