“The indispensible judicial requisite is intellectual humility.”
Concurring, American Federation of Labor v. American Sash & Door Co., 335 U.S. 538 (1949).
Judicial opinions
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Felix Frankfurter 67
American judge 1882–1965Related quotes

Man in the Modern Age (1933)
Context: When the titanic apparatus of the mass-order has been consolidated, the individual has to serve it, and must from time to time combine with his fellows in order to renovate it. If he wants to make his livelihood by intellectual activity, he will find it very difficult to do this except by satisfying the needs of the many. He must give currency to something that will please the crowd. They seek satisfaction in the pleasures of the table, eroticism, self-assertion; they find no joy in life if one of these gratifications be curtailed. They also desire some means of self-knowledge. They desire to be led in such as way that they can fancy themselves leaders. Without wishing to be free, they would fain be accounted free. One who would please their taste must produce what is really average and commonplace, though not frankly styled such; must glorify or at least justify something as universally human. Whatever is beyond their understanding is uncongenial to them.
One who would influence the masses must have recourse to the art of advertisement. The clamour of puffery is to-day requisite even for an intellectual movement. The days of quiet and unpretentious activity seem over and done with. You must keep yourself in the public eye, give lectures, make speeches, arouse a sensation. Yet the mass-apparatus lacks true greatness of representation, lacks solemnity. <!-- pp. 43 - 44

Letter to Guy H. Raner Jr. (28 September 1949), from article by Michael R. Gilmore in Skeptic magazine, Vol. 5, No. 2 (1997)
1940s
Context: I have repeatedly said that in my opinion the idea of a personal God is a childlike one. You may call me an agnostic, but I do not share the crusading spirit of the professional atheist whose fervor is mostly due to a painful act of liberation from the fetters of religious indoctrination received in youth. I prefer an attitude of humility corresponding to the weakness of our intellectual understanding of nature and of our own being.

Letter to George Washington (November 1779)
"For Want of a Metaphor", p. 151
The Flamingo's Smile (1985)
“Education with humility leads to wisdom; without humility, it leads to arrogance.”
Bishop Daly: Catholic schools should embrace faith, never compromise https://www.catholicnewsagency.com/news/46624/bishop-daly-catholic-schools-should-embrace-faith-never-compromise (18 November 2020)

“Self-confidence is the first requisite to great undertakings.”
The Life of Pope http://www.gutenberg.org/etext/5101
Lives of the English Poets (1779–81)

“There is nothing more requisite in business than dispatch.”
Act V, sc. 1.
The Drummer (1716)

“The 3 Requisites for Success - Ruthless, Relentless, Remorseless”
The 3 R's
p. 274. https://archive.org/stream/memoriesbyadmira00fishuoft#page/274/mode/1up
Also The World Crisis, Vol 1, 1911-14 (1923), Churchill, Thornton Butterworth (London), p. 73.
Memories (1919) https://archive.org/stream/memoriesbyadmira00fishuoft#page/n0/mode/2up

American Constitutional Law (1978), Preface to the First Edition