Now, although the papyrus upon, which this statement and prayer are found was written about two thousand years after Men-kau-R[=a] reigned, there is no doubt that they were copied from texts which were themselves copied at a much earlier period, and that the story of the finding of the text inscribed upon an iron slab is contemporary with its actual discovery by Herut[=a]t[=a]f. It is not necessary to inquire here whether the word "find" (in Egyptian _qem_) means a genuine discovery or not, but it is clear that those who had the papyrus copied saw no absurdity or impropriety in ascribing the text to the period of Men-kau-R[=a]. Another text, which afterwards also became a chapter of the Book of the Dead, under the title "Chapter of not letting the heart of the deceased be driven away from him in the underworld," was inscribed on a coffin of the XIth dynasty, about B.C. 2500, and in it we have the following petition: "May naught stand up to oppose me in judgment in the presence of the lords of the trial (literally, 'lords of things'); let it not be said of me and of that which I have done, 'He hath done deeds against that which is very right and true'; may naught be against me in the presence of the Great God, the Lord of Amentet." [Footnote: _Chapters of Coming Forth by Day_, p. 78.] From these passages we are right in assuming that before the end of the IVth dynasty the idea of being "weighed in the balance" was already evolved; that the religious schools of Egypt had assigned to a god the duty of watching the balance when cases were being tried; that this weighing in the balance took place in the presence of the beings called _Shenit_, who were believed to control the acts and deeds of men; that it was thought that evidence unfavourable to the deceased might be produced by his foes at the judgment; that the weighing took place in the presence of the Great God, the Lord of Amentet; and that the heart of the deceased might fail him either physically or morally. The deceased addresses his heart, calling it is "mother," and next identifies it with his _ka_ or double, coupling the mention of the _ka_ with the name of the god Khnemu: these facts are exceedingly important, for they prove that the deceased considered his heart to be the source of his life and being, and the mention of the god Khnemu takes the date of the composition back to a period coaeval with the beginnings of religious thought in Egypt. It was the god Khnemu who assisted Thoth in performing the commands of God at the creation, and one very interesting sculpture at Philae shows Khnemu in the act of fashioning man upon a potter's wheel. The deceased, in mentioning Khnemu's name, seems to invoke his aid in the judgment as fashioner of man and as the being who is in some respects responsible for the manner of his life upon earth.