"What could have caused such contention and conflict? "

"And now, ponder upon these things. What could have caused such contention and conflict? Why is it that the advent of every true Manifestation of God hath been accompanied by such strife and tumult, by such tyranny and upheaval? This notwithstanding the fact that all the Prophets of God, whenever made manifest unto the peoples of the world, have invariably foretold the coming of yet another Prophet after them, and have established such signs as would herald the advent of the future Dispensation. To this the records of all sacred books bear witness. Why then is it that despite the expectation of men in their quest of the Manifestations of Holiness, and in spite of the signs recorded in the sacred books, such acts of violence, of oppression and cruelty, should have been perpetrated in every age and cycle against all the Prophets and chosen Ones of God? Even as He hath revealed: “As oft as an Apostle cometh unto you with that which your souls desire not, ye swell with pride, accusing some of being impostors and slaying others.” 11 ...

"Leaders of religion, in every age, have hindered their people from attaining the shores of eternal salvation, inasmuch as they held the reins of authority in their mighty grasp. Some for the lust of leadership, others through want of knowledge and understanding, have been the cause of the deprivation of the people. By their sanction and authority, every Prophet of God hath drunk from the chalice of sacrifice, and winged His flight unto the heights of glory. What unspeakable cruelties they that have occupied the seats of authority and learning have inflicted upon the true Monarchs of the world, those Gems of divine virtue! Content with a transitory dominion, they have deprived themselves of an everlasting sovereignty. Thus, their eyes beheld not the light of the countenance of the Well-Beloved, nor did their ears hearken unto the sweet melodies of the Bird of Desire. For this reason, in all sacred books mention hath been made of the divines of every age. Thus He saith: “O people of the Book! Why disbelieve the signs of God to which ye yourselves have been witnesses?” 12

-Bahá'u'lláh, The Kitáb-i-Íqán (The Book of Certitude), pp. 13-17

11.	Qur’án 2:87.
12.	Qur’án 3:70