"Wherever he finds truth or reality, he must hold to it, forsaking, discarding all else; for outside of reality there is naught but superstition and imagination."

"Although the divine teachings are truth and reality, yet with the passage of time thick clouds envelop and obscure them. These clouds are imitations and superstitions; they are not the fundamentals. Then the Sun of Truth, the Word of God, arises again, shines forth once more in the glory of its power and disperses the enveloping darkness. For a long time the divine precepts of the effulgent Word were obscured by clouds of superstition and error until Bahá’u’lláh appeared upon the horizon of humanity, rent the shadows, scattered the clouds and revealed anew the foundations of the teachings of God.

The first teaching of Bahá’u’lláh is the duty incumbent upon all to investigate reality. What does it mean to investigate reality? It means that man must forget all hearsay and examine truth himself, for he does not know whether statements he hears are in accordance with reality or not. Wherever he finds truth or reality, he must hold to it, forsaking, discarding all else; for outside of reality there is naught but superstition and imagination. For example, during the days of Jesus Christ the Jews were expecting the appearance of the Messiah, praying and beseeching God day and night that the Promised One might appear. Why did they reject Him when He did appear? They denied Him absolutely, refused to believe in Him. There was no abuse and persecution which they did not heap upon Him. They reviled Him with curses, placed a crown of thorns upon His head, led Him through the streets in scorn and derision and finally crucified Him. Why did they do this? Because they did not investigate the truth or reality of Christ and were not able to recognize Him as the Messiah of God. Had they investigated sincerely for themselves, they would surely have believed in Him, respected Him and bowed before Him in reverence. They would have considered His manifestation the greatest bestowal upon mankind. They would have accepted Him as the very Savior of man; but, alas, they were veiled, they held to imitations of ancestral beliefs and hearsay and did not investigate the truth of Christ. They were submerged in the sea of superstitions and were, therefore, deprived of witnessing that glorious bounty; they were withheld from the fragrances or breaths of the Holy Spirit and suffered in themselves the greatest debasement and degradation.

Reality or truth is one, yet there are many religious beliefs, denominations, creeds and differing opinions in the world today. Why should these differences exist? Because they do not investigate and examine the fundamental unity, which is one and unchangeable. If they seek reality itself, they will agree and be united; for reality is indivisible and not multiple. It is evident, therefore, that there is nothing of greater importance to mankind than the investigation of truth."

`Abdu'l-Bahá, The Promulgation of Universal Peace, pp.62-63 25 

25 April 1912 
(excerpt from) Talk at Home of Mr. and Mrs. Arthur J. Parsons 
1700 Eighteenth Street, NW, 
Washington, D.C.