[The Dala'il-i-Sab'ih (Seven Proofs), the most important of the polemical works of the Báb, was revealed during that same period [Mah-Ku]. Remarkably lucid, admirable in its precision, original in conception, unanswerable in its argument, this work, apart from the many and divers proofs of His mission which it adduces, is noteworthy for the blame it assigns to the "seven powerful sovereigns ruling the world" in His day, as well as for the manner in which it stresses the responsibilities, and censures the conduct, of the Christian divines of a former age who, had they recognized the truth of Muhammad's mission, He contends, would have been followed by the mass of their co-religionists. (Shoghi Effendi, 'God Passes By')]
-- Provisional English translation from the French of Nicolas – by Peter Terry
In the Name of God, the Only Unique, the Only Unique.  Praises be to God, for there is none other God but He, the Only Unique, the Only Unique. All splendor  comes from God, upon the 'Man Yuzhiruhu'llah'  and upon His Apostles even until the eternity of eternities.
We have examined the letter which was written to us: if one were to desire a detailed explanation of the proofs establishing the truth of this Manifestation , this one [such an explanation] would be too long and the tablets of the world of existence and of possibilities  would not be sufficient for this. 
But, the essence of this discourse and the pearl of this aim  are that there never has been and there is now no doubt that the Eternal God has always been immovable in the Loftiness of His Divinity, in the sublimity of His Pure Attributes, and that He will remain always in the Splendor and the immutability of His Infinite Grandeur. Nothing has known Him as He should be known and the praises which have been made of Him have remained below Him. He is Pure of all names, Free from all semblances.  Everything is known to Him and His Grandeur resides in this that He remains unknown to all. His Creation has never had a commencement and will never have an end as then there would have been or there would be a necessary stoppage to [interruption in] His kindnesses.  All the times that it has been found useful in this world of Possibilities , He has sent Prophets and has made descend from the Heaven the Books of the Law: He will do so again when the need will make itself felt.