The Buddha's Name Can Only Be Activated When Engraved in the Mind

Question: I also fall asleep every night listening to the sacred name of Amitābha Buddha, engraving the sacred name deep into my consciousness, into the very marrow of my bones.

Answer: Marrow corresponds to the manas (mind-root). The Buddha's name must be engraved into the manas so that it can be utilized at the time of death and in future lives, ensuring that the karmic seeds are not lost. If it is merely engraved into the consciousness, the consciousness ceases at death and will no longer be effective. In future lives, it will be even less effective.