Each period of a life has its own evaluation, and opinions differ about them. Some say the early years are best, others the middle years, and so on. But the truth is that it depends on a person's karma more than on his age as to which shall prove best for him and from which he shall extract the most satisfaction.
-- Notebooks Category 9: From Birth to Rebirth > Chapter 3: Laws and Patterns of Experience > # 238
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