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解釋：節(jié)儉就會產(chǎn)生對生產(chǎn)不利的因素，侈靡則造成對財富的耗費。

感恩是負面情緒的解毒劑，是嫉妒、敵意、擔憂和憤怒的中和劑。

Memory was in this respect similar to anticipation: an instrument of simplification and selection.

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.