Marx once noted with sober precision: man cannot again become a child without falling into childishness. "But does the naivety of a child really not overjoy him," he wrote further, "and should he really not try to reproduce his true essence on a higher plane?"
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This is relevant both to mankind and to the individual. The meaning of working on oneself spiritually is in reproducing one's true essence on a higher plane. For this, one must be less forgetful of what one was, and what went before.
Notes from Wikiquote
p. 74