It is not, however, with either of these two Faiths that we are primarily concerned. It is to Islám and, to a lesser extent, to Christianity that my theme is directly related. Islám, from which the Faith of Bahá’u’lláh has sprung, even as did Christianity from Judaism, is the religion within whose pale that Faith first rose and developed, from whose ranks the great mass of Bahá’í adherents have been recruited, and by whose leaders they have been, and indeed are still being, persecuted. Christianity, on the other hand, is the religion to which the vast majority of Bahá’ís of non-Islamic extraction belong, within whose spiritual domain the Administrative Order of the Faith of God is rapidly advancing, and by whose ecclesiastical exponents that Order is being increasingly assailed. Unlike Hinduism, Buddhism, Judaism and even Zoroastrianism which, in the main, are still unaware of the potentialities of the Cause of God, and whose response to its Message is as yet negligible, the Muḥammadan and Christian Faiths may be regarded as the two religious systems which are sustaining, at this formative stage in its evolution, the full impact of so tremendous a Revelation. Let us, then, consider what the Founders of the Bahá’í Faith have addressed to, or written about, the recognized leaders of Islám and Christianity. We have already considered the passages with reference to the kings of Islám, whether as Caliphs reigning in Constantinople, or as _Sh_áhs of Persia who ruled the kingdom as temporary trustees for the expected Imám. We have also noted the Tablet which Bahá’u’lláh specifically revealed for the Roman Pontiff, and the more general message in the Súriy-i-Mulúk directed to the kings of Christendom. No less challenging and ominous is the Voice that has warned and called to account the Muḥammadan divines and the Christian clergy.