The Man who Tapped the Secrets of the Universe
Quotes about fatigue
page 2

In "Jack LaLanne, Founder of Modern Fitness Movement, Dies at 96, New York Times."
Source: Mathematics for the Nonmathematician (1967), pp. 255-256.

letter to his friend Zapater, April 23, 1794; in Goya; Noticias biograficas, Francisco Zapater y Gomez, Zaragoza, 1868; first published in 'La Perseverencia', p. 53; as quoted in Francisco Goya, Hugh Stokes, Herbert Jenkins Limited Publishers, London, 1914, p. 203-204
1790s

Source: The Book on the Taboo Against Knowing Who You Are (1966), p. 83

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.

Address on Taking Command of the Army of the Potomac (June 28, 1863); published in The Civil War: Great Speeches and Documents (2006)

Vol. 1, Chap. 10.
The Decline And Fall Of The Roman Empire: Volume 1 (1776)

In Liberator, August 13, 1836, as quoted in [Thomsett, Michael C., Thomsett, Linda Rose, A Speaker's Treasury of Quotations: Maxims, Witticisms and Quips for Speeches and Presentations, https://books.google.com/books?id=igYyBgAAQBAJ, 17 March 2009, McFarland, 978-0-7864-2945-5, 75]

As quoted in "“Fostering Leadership”: online talk with Chulpan Khamatova" in Vladimir Potanin Foundation (7 August 2020) https://www.fondpotanin.ru/en/press/news/fostering-leadership-online-talk-with-chulpan-khamatova/
Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from The Teachings of Don Juan (Chapter 4)