“But yet another “exceeding great mystery” had to be performed if the deceased was to be enabled to enter into heaven by its four doors at will, and to enjoy the air which came through each.
The north wind belonged to Osiris, the south wind to Râ, the west wind to Isis, and the east wind to Nephthys; and for the deceased to obtain power over each and all of these it was necessary for him to be master of the doors through which they blew.
This power could only be obtained by causing pictures of the four doors to be painted on the coffin with a figure of Thoth opening each. Some special importance was attached to these, for the rubric says, “Let none who is outside know this chapter, for it is a great mystery, and those who dwell in the swamps (i.e., the ignorant) know it not.”
“Thou shalt not do this in the presence of any person except thy father, or thy son, or thyself alone; for it is indeed an exceedingly great mystery which no man whatever knoweth.” (Ibid., p. 212).
One of the delights coveted by the deceased was to sail over heaven in the boat of Râ, in company with the gods of the funeral cycle of Osiris; this happiness could be secured for him by painting certain pictures, and by saying over them certain words of power.
On a piece of clean papyrus a boat is to be drawn with ink made of green âbut mixed with ânti water, and in it are to be figures of Isis, Thoth, Shu, and Khepera, and the deceased; when this has been done the papyrus must be fastened to the breast of the deceased, care being taken that it does not actually touch his body.
Then shall his spirit enter into the boat of Râ each day, and the god Thoth shall take heed to him, and he shall sail about with Râ into any place that he wisheth. (See Chapters of Coming Forth by Day, p. 162).
E.A. Wallis Budge, Egyptian Magic, London, 1901. Pp. 110-1.