The Spiral Dance: A Rebirth of the Ancient Religion of the Goddess (1979)
“Our fatigue is often caused not by work, but by worry, frustration and resentment.”
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Dale Carnegie 98
American writer and lecturer 1888–1955Related quotes

Source: Signs of Life: 40 Catholic Customs and Their Biblical Roots

“A coach is someone who can give correction without causing resentment.”

Source: My Double Life (1907), Ch. 33 <!-- p. 369 -->
Context: Life is short, even for those who live a long time, and we must live for the few who know and appreciate us, who judge and absolve us, and for whom we have the same affection and indulgence. The rest I look upon as a mere crowd, lively or sad, loyal or corrupt, from whom there is nothing to be expected but fleeting emotions, either pleasant or unpleasant, which leave no trace behind them. We ought to hate very rarely, as it is too fatiguing; remain indifferent to a great deal, forgive often and never forget.
Think Better: An Innovator's Guide to Productive Thinking

1960s, The Drum Major Instinct (1968)

Source: Letters to a Young Scientist (2013), chapter 5, "The Creative Process", page 69.