It is not pleasant to reach old age. One tires easily--not only physically but also mentally--and one begins to weary of the routines of merely living, performing similar acts day after day. I speak of course of the average person, mass humanity--but one who has kept his mind alive, alert, eager to know, learn, and understand, who has developed his inmost resources cultural and spiritual, can never get bored.
-- Notebooks Category 13: Human Experience > Chapter 3: Youth and Age > # 178
-- Perspectives > Chapter 13: Human Experience > # 43