“Failure to live up to a truth doesn’t make it any less true, less worth striving for, or less worth defending.”
"Confessions of a Hypocrite: Utopia in the Age of Ecocide" Kosmos (2016) https://www.kosmosjournal.org/article/confessions-of-a-hypocrite-utopia-in-the-age-of-ecocide/
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Source: Epigrams, p. 345

R.U.R. supplement in The Saturday Review (1923)
Context: Be these people either Conservatives or Socialists, Yellows or Reds, the most important thing is — and that is the point I want to stress — that all of them are right in the plain and moral sense of the word... I ask whether it is not possible to see in the present social conflict of the world an analogous struggle between two, three, five equally serious verities and equally generous idealisms? I think it is possible, and that is the most dramatic element in modern civilization, that a human truth is opposed to another human truth no less human, ideal against ideal, positive worth against worth no less positive, instead of the struggle being as we are so often told, one between noble truth and vile selfish error.

“For a friend with an understanding heart is worth no less than a brother.”
VIII. 585–586 (tr. G. H. Palmer).
Odyssey (c. 725 BC)
Source: The Odyssey

“Whatever is worth saying, can be stated in fifty words or less.”
as quoted by Gian-Carlo Rota in Words spoken at the memorial service for S. M. Ulam (The Lodge, Los Alamos, New Mexico, May 17, 1984), published in The Mathematical Intelligencer, Volume 6, Number 4 / December, 1984

Source: The Intelligent Investor: The Classic Text on Value Investing (1949), Chapter XIV, Stockholders and Managements, p. 209
“Thrones and crowns of worldly kings carry worth less than shows of donkey for us.”
Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 270

1900s, Address at the Prize Day Exercises at Groton School (1904)
Context: Of course, the worst of all lives is the vicious life; the life of a man who becomes a positive addition to the forces of evil in a community. Next to that and when I am speaking to people who, by birth and training and standing, ought to amount to a great deal, I have a right to say only second to it in criminality comes the life of mere vapid ease, the ignoble life of a man who desires nothing from his years but that they shall be led with the least effort, the least trouble, the greatest amount of physical enjoyment or intellectual enjoyment of a mere dilettante type. The life that is worth living, and the only life that is worth living, is the life of effort, the life of effort to attain what is worth striving for.

1860s
Source: Letter to John Fraser http://www.bartleby.com/66/71/12271.html (1868)