Let none, in this Day, hold fast to aught save that which hath been manifested in this Revelation. Such is the decree of God, aforetime and hereafter -- a decree wherewith the Scriptures of the Messengers of old have been adorned. Such is the admonition of the Lord, aforetime and hereafter -- an admonition wherewith the preamble to the Book of Life hath been embellished, did ye but perceive it. Such is the commandment of the Lord, aforetime and hereafter; beware lest ye choose instead the part of ignominy and abasement. Naught shall avail you in this Day but God, nor is there any refuge to flee to save Him, the Omniscient, the All-Wise. Whoso hath known Me hath known the Goal of all desire, and whoso hath turned unto Me hath turned unto the Object of all adoration. Thus hath it been set forth in the Book, and thus hath it been decreed by God, the Lord of all worlds. To read but one of the verses of My Revelation is better than to peruse the Scriptures of both the former and latter generations. This is the Utterance of the All-Merciful, would that ye had ears to hear! Say: This is the essence of knowledge, did ye but understand.

Various petitions have come before Our throne from the believers, concerning laws from God . . . We have, in consequence, revealed this Holy Tablet and arrayed it with the mantle of His Law that haply the people may keep the commandments of their Lord.
"For a number of years", Bahá'u'lláh states in one of His Tablets, "petitions reached the Most Holy Presence from various lands begging for the laws of God, but We held back the Pen ere the appointed time had come." Not until twenty years from the birth of His Prophetic Mission in the Síyáh-Chál of Tihrán had elapsed did Bahá'u'lláh reveal the Kitáb-i-Aqdas, the Repository of the laws of His Dispensation. Even after its revelation the Aqdas was withheld by Him for some time before it was sent to the friends in Persia. This divinely purposed delay in the revelation of the basic laws of God for this age, and the subsequent gradual implementation of their provisions, illustrate the principle of progressive revelation which applies even within the ministry of each Prophet.