It is not pleasant to think of the decay which overtakes the faculties of so many persons who live into their seventies or eighties, yet it is a necessary thought for those who are only half that age or less to entertain. It may act as a reminder or even as a spur to quicken their pace upon the Quest.

-- Notebooks Category 9: From Birth to Rebirth > Chapter 1: Death, Dying, and Immortality > # 45