"Looking back, I realize that this period of my life has irrevocably come to a close; my happy-go-lucky, carefree schooldays are gone forever. I don't even miss them. I've outgrown them. I can no longer just kid around, since my serious side is always there."

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But life is glorious when it is happy; days are carefree when they are happy; the interplay of thought and imagination is far and superior to that of muscle and sinew. Let me tell you, if you don't know it from your own experience, that reading a good book, losing yourself in the interest of words and thoughts, is for some people (me, for instance) an incredible intensity of happiness.

— Isaac Asimov