To every discerning and illumined heart it is evident that God, the unknowable Essence, the divine Being, is immensely exalted beyond every human attribute, such as corporeal existence, ascent and descent, egress and regress. Far be it from His glory that human tongue should adequately recount His praise, or that human heart comprehend His fathomless mystery. He is and hath ever been veiled in the ancient eternity of His Essence, and will remain in His Reality everlastingly hidden from the sight of men. "No vision taketh in Him, but He taketh in all vision; He is the Subtile, the All-Perceiving."[1] No tie of direct intercourse can possibly bind Him to His creatures. He standeth exalted beyond and above all separation and union, all proximity and remoteness. No sign can indicate His presence or His absence; inasmuch as by a word of His command all that are in heaven and on earth have come to exist, and by His wish, which is the Primal Will itself, all have stepped out of utter nothingness into the realm of being, the world of the visible.
[1 Qur'án 6:103.]
Gracious God! How could there be conceived any existing relationship or possible connection between His Word and they that are created of it? The verse: "God would have you beware of Himself"[2] unmistakably beareth witness to the reality of Our argument, and the words: "God was alone; there was none else besides Him" are a sure testimony of its truth. All the Prophets of God and their chosen Ones, all the divines, the sages, and the wise of every generation, unanimously recognize their inability to attain unto the comprehension of that Quintessence of all truth, and confess their incapacity to grasp Him, Who is the inmost Reality of all things.
[2 Qur'án 3:28.]
The door of the knowledge of the Ancient of Days being thus closed in the face of all beings, the Source of infinite grace, according to His saying: "His grace hath transcended all things; My grace hath encompassed them all" hath caused those luminous Gems of Holiness[3] to appear out of the realm of the spirit, in the noble form of the human temple, and be made manifest unto all men, that they may impart unto the world the mysteries of the unchangeable Being, and tell of the subtleties of His imperishable Essence. 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.
[3 The Messengers of God]
(Baha'u'llah, The Kitab-i-Iqan, p. 98)