“Is it not enough for them that We have sent down unto Thee the Book?”

"O affectionate seeker! Shouldst thou soar in the holy realm of the spirit, thou wouldst recognize God manifest and exalted above all things, in such wise that thine eyes would behold none else but Him. “God was alone; there was none else besides Him.” So lofty is this station that no testimony can bear it witness, neither evidence do justice to its truth. Wert thou to explore the sacred domain of truth, thou wilt find that all things are known only by the light of His recognition, that He hath ever been, and will continue for ever to be, known through Himself. And if thou dwellest in the land of testimony, content thyself with that which He, Himself, hath revealed: “Is it not enough for them that We have sent down unto Thee the Book?” 7 This is the testimony which He, Himself, hath ordained; greater proof than this there is none, nor ever will be: “This proof is His Word; His own Self, the testimony of His truth.”"

-Bahá'u'lláh, The Kitáb-i-Íqán, pp. 91-92 


 7. Qur’án 29:51.