Chapters XXI–XXIII secured the help of Thoth in “opening the mouth” of the deceased, whereby he obtained the power to breathe and think and drink and eat.
Thoth recited spells over the gods whilst Ptah untied the bandages and Shu forced open their mouths with an iron (? Chapter XXIV gave to the deceased a knowledge of the "words of power" (, ) which were used by the great god Tem-Khepera, and Chapter XXV restored to him his memory.
All the great papyri of the Book of the Dead begin with a HYMN TO RĀ, who from the period of the IVth dynasty was the “King of the Gods” of Egypt.
His cult was finally “established” under the Vth dynasty when the king of Egypt began to call himself in official documents and monuments "Son of the Sun," .
Thy father is the Sky-god and thy mother is the Sky-goddess, and thou art Horus of the Eastern and Western skies. O Divine Youth, who art self-created, I cannot comprehend thee.
Thou art the lord of heaven and earth, and didst create beings celestial and beings terrestrial.
Thou journeyest through spaces [requiring] millions of years [to pass over] in one little moment of time, and then thou settest and dost make an end of the hours.” The subject matter of the above extract is treated at greater length in Chapter XV, which contains a long Hymn to Rā at his rising, or Amen-Rā, or Rā united to other solar gods, , the setting sun).