“Verily, there is no God but Me, the Most Excellent, the All-Praised.”

"Be watchful lest the concerns and preoccupations of this world prevent you from observing that which hath been enjoined upon you by Him Who is the Mighty, the Faithful. Be ye the embodiments of such steadfastness amidst mankind that ye will not be kept back from God by the doubts of those who disbelieved in Him when He manifested Himself, invested with a mighty sovereignty. Take heed lest ye be prevented by aught that hath been recorded in the Book from hearkening unto this, the Living Book, Who proclaimeth the truth: “Verily, there is no God but Me, the Most Excellent, the All-Praised.” Look ye with the eye of equity upon Him Who hath descended from the heaven of Divine will and power, and be not of those who act unjustly."

 -Bahá'u'lláh, The Kitáb-i-Aqdas, pp. 66-67