"O Son Of Man!
Divest not thyself of My beauteous robe,
and forfeit not thy portion from My wondrous fountain,
lest thou shouldst thirst for evermore."
~Baha'u'llah, The Hidden Words of Baha'u'llah

Progressive Revelation

Bahá'ís believe that throughout history the Creator has revealed Himself and His Teachings to humanity through a series of Divine Messengers. The Mission of these Emissaries from God is to educate and train the souls of human beings. These Messengers or Teachers have come to all people and parts of the planet.

Bahá'ís believe that there is, in essence, only one religion and all the Messengers of God have progressively revealed its nature. These religions are as chapters of the same book, are as gems which are linked together by a golden chain. God has never left humanity without guidance, nor, the Bahá'ís believe, will He ever stop sending Messengers.

There will be others coming after Bahá'u'lláh, until the end of time. Bahá'u'lláh has specifically stated that another Teacher will not appear sooner than a thousand years. Until that time, the Bahá'ís believe Bahá'u'lláh has brought the guidance that humanity needs.

"A great stumbling block to many, in the way of religious unity, is the difference between the Revelations given by the different Prophets. What is commanded by one is forbidden by another; how then can both be right, how can both be proclaiming the Will of God? Surely the truth is One, and cannot change. Yes, the Absolute Truth is One and cannot change, but the Absolute Truth is infinitely beyond the present range of human understanding, and our conceptions of it must constantly change. Our earlier, imperfect ideas will be by the Grace of God replaced, as time goes on, by more and more adequate conceptions. Bahá'u'lláh says, in a Tablet to some Bahá'ís of Persia: --

O people! Words are revealed according to capacity so that the beginners may make progress. The milk must be given according to measure so that the babe of the world may enter into the Realm of Grandeur and be established in the Court of Unity.

Together, the world's great religions are expressions of a single unfolding Divine plan: "the changeless Faith of God, eternal in the past, eternal in the future." --Bahá'u'lláh, Gleanings, p. 136

It is milk that strengthens the babe so that it can digest more solid food later on. To say that because one Prophet is right in giving a certain teaching at a certain time, therefore another Prophet must be wrong Who gives a different teaching at a different time, is like saying that because milk is the best food for the newborn babe, therefore, milk and nothing but milk should be the food of the grown man also, and to give any other diet would be wrong! `Abdu'l-Bahá says: --

Each divine revelation is divided into two parts. The first part is essential and belongs to the eternal world. It is the exposition of Divine truths and essential principles. It is the expression of the Love of God. This is one in all the religions, unchangeable and immutable. The second part is not eternal; it deals with practical life, transactions and business, and changes according to the evolution of man and the requirements of the time of each Prophet. For example. ... During the Mosaic period the hand of a person was cut off in punishment of a small theft; there was a law of an eye for an eye and a tooth for a tooth, but as these laws were not expedient in the time of Christ, they were abrogated. Likewise divorce had become so universal that there remained no fixed laws of marriage, therefore His Holiness Christ forbade divorce.

According to the exigencies of the time, His Holiness Moses revealed ten laws for capital punishment. It was impossible at that time to protect the community and to preserve social security without these severe measures, for the children of Israel lived in the wilderness of Tah, where there were no established courts of justice and no penitentiaries. But this code of conduct was not needed in the time of Christ. The history of the second part of religion is unimportant, because it relates to the customs of this life only; but the foundation of the religion of God is one, and His Holiness Bahá'u'lláh has renewed that foundation.

The religion of God is the One Religion, and all the Prophets have taught it, but it is a living and a growing thing, not lifeless and unchanging. In the teaching of Moses we see the Bud; in that of Christ the Flower; in that of Bahá'u'lláh the Fruit. The flower does not destroy the bud, nor does the fruit destroy the flower. It destroys not, but fulfills. The bud scales must fall in order that the flower may bloom, and the petals must fall that the fruit may grow and ripen. Were the bud scales and the petals wrong or useless, then, that they had to be discarded? Nay, both in their time were right and necessary; without them there could have been no fruit. So it is with the various prophetic teachings; their externals change from age to age, but each revelation is the fulfillment of its predecessors; they are not separate or incongruous, but different stages in the life history of the One Religion, which has in turn been revealed as seed, as bud and as flower, and now enters on the stage of fruition."

-- Esslemont, Baha'u'llah and the New Era

Fundamental Principle of Religious Truth

"... The Revelation, of which Bahá'u'lláh is the source and center, abrogates none of the religions that have preceded it, nor does it attempt, in the slightest degree, to distort their features or to belittle their value. It disclaims any intention of dwarfing any of the Prophets of the past, or of whittling down the eternal verity of their teachings. It can, in no wise, conflict with the spirit that animates their claims, nor does it seek to undermine the basis of any man's allegiance to their cause. Its declared, its primary purpose is to enable every adherent of these Faiths to obtain a fuller understanding of the religion with which he stands identified, and to acquire a clearer apprehension of its purpose. It is neither eclectic in the presentation of its truths, nor arrogant in the affirmation of its claims. Its teachings revolve around the fundamental principle that religious truth is not absolute but relative, that Divine Revelation is progressive, not final. Unequivocally and without the least reservation it proclaims all established religions to be divine in origin, identical in their aims, complementary in their functions, continuous in their purpose, indispensable in their value to mankind.

"All the Prophets of God," asserts Bahá'u'lláh in the Kitáb-I-Iqán, "abide in the same tabernacle, soar in the same heaven, are seated upon the same throne, utter the same speech, and proclaim the same Faith." From the "beginning that hath no beginning," these Exponents of the Unity of God and Channels of His incessant utterance have shed the light of the invisible Beauty upon mankind, and will continue, to the "end that hath no end," to vouchsafe fresh revelations of His might and additional experiences of His inconceivable glory. To contend that any particular religion is final, that "all Revelation is ended, that the portals of Divine mercy are closed, that from the daysprings of eternal holiness no sun shall rise again, that the ocean of everlasting bounty is forever stilled, and that out of the Tabernacle of ancient glory the Messengers of God have ceased to be made manifest" would indeed be nothing less than sheer blasphemy.

"They differ," explains Bahá'u'lláh in that same epistle, "only in the intensity of their revelation and the comparative potency of their light." And this, not by reason of any inherent incapacity of any one of them to reveal in a fuller measure the glory of the Message with which He has been entrusted, but rather because of the immaturity and unpreparedness of the age He lived in to apprehend and absorb the full potentialities latent in that Faith.

"Know of a certainty," explains Bahá'u'lláh, "that in every Dispensation the light of Divine Revelation has been vouchsafed to men in direct proportion to their spiritual capacity. Consider the sun. How feeble its rays the moment it appears above the horizon. How gradually its warmth and potency increase as it approaches its zenith, enabling meanwhile all created things to adapt themselves to the growing intensity of its light. How steadily it declines until it reaches its setting point. Were it, all of a sudden, to manifest the energies latent within it, it would, no doubt, cause injury to all created things.... In like manner, if the Sun of Truth were suddenly to reveal, at the earliest stages of its manifestation, the full measure of the potencies which the providence of the Almighty has bestowed upon it, the earth of human understanding would waste away and be consumed; for men's hearts would neither sustain the intensity of its revelation, nor be able to mirror forth the radiance of its light. Dismayed and overpowered, they would cease to exist."

It is for this reason, and this reason only, that those who have recognized the Light of God in this age, claim no finality for the Revelation with which they stand identified, nor arrogate to the Faith they have embraced powers and attributes intrinsically superior to, or essentially different from, those which have characterized any of the religious systems that preceded it…

"The Revelation of which I am the bearer," Bahá'u'lláh explicitly declares, "is adapted to humanity's spiritual receptiveness and capacity; otherwise, the Light that shines within me can neither wax nor wane. Whatever I manifest is nothing more or less than the measure of the Divine glory which God has bidden me reveal."

If the Light that is now streaming forth upon an increasingly responsive humanity with a radiance that bids fair to eclipse the splendor of such triumphs as the forces of religion have achieved in days past; if the signs and tokens which proclaimed its advent have been, in many respects, unique in the annals of past Revelations; if its votaries have evinced traits and qualities unexampled in the spiritual history of mankind; these should be attributed not to a superior merit which the Faith of Bahá'u'lláh, as a Revelation isolated and alien from any previous Dispensation, might possess, but rather should be viewed and explained as the inevitable outcome of the forces that have made of this present age an age infinitely more advanced, more receptive, and more insistent to receive an ampler measure of Divine Guidance than has hitherto been vouchsafed to mankind."

-- Shoghi Effendi, The World Order of Baha'u'llah

Additional Explanation