"During his sojourn in Mah-Ku, the Bab composed a great number of works amongst the most important of which may be especially mentioned the Persian Bayan and the Seven Proofs, (Dala'il-i-Sab'ih) both of which contain ample internal evidence of having been written at this period. Indeed, if we may credit a statement made in the Tarikh-i-Jadid, on the authority of Mirza Abdu'l-Vahhab, the various writings of the Bab, current in Tabriz alone, amounted in all to not less than a million verses!" ("A Traveller's Narrative" Note L, p. 200.)

Regarding the "Dala'il-i-Sab'ih," Nicolas writes as follows: "`The Book of Seven Proofs' is the most important of the polemical works from the pen of Siyyid Ali-Muhammad, dit le Bab." (Preface, page 1.)

"His correspondent evidently asked him for the proofs of his mission and his answer is admirable for its precision and clearness. It rests upon two verses of the Qur'an; according to the first, no one can reveal verses even though assisted by the entire world of men and evil spirits; according to the second, no one can understand the meaning of the verses of the Qur'an except God, and men of solid learning." (Preface, p. 5.)

"Clearly the arguments of the Bab are new and original and one can see, by this brief reference, of what profound interest must be his literary work. The scope of my work does not permit me to expound, even briefly, the principal dogmas of a bold doctrine the form of which is both brilliant and attractive. I hope to do so in the future but I wish to make another comment upon the `Book of the Seven Proofs': toward the end of his book, the Bab speaks of the miracles which have accompanied his manifestation. This will probably astonish the readers, as we have seen the new apostle deny clearly the truth of the physical miracles which the Muhammadan imagination attributes to Muhammad. He affirms that, for himself as well as for the Arabian Prophet, the only proof of his mission was the outpouring of the verses. He offers no other proof, not because he is unable to perform miracles, (God being all-powerful) but simply because physical marvels are of inferior order in comparison with spiritual miracles." (Preface, pp. 12-13.) ("Le Livre des Sept Preuves," translation by A. L. M. Nicolas.)