“The mark of a truly civilized man is confidence in the strength and security derived from the inquiring mind.”
Dennis v. United States, 241 U.S. 494, 556 (1951).
Judicial opinions
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Felix Frankfurter 67
American judge 1882–1965Related quotes

“The strength of a nation derives from the integrity of the home.”

Peace and the Public Mind (1935)
Context: The force which makes for war does not derive its strength from the interested motives of evil men; it derives its strength from the disinterested motives of good men. Pacifists have sometimes evaded that truth as making too great a concession to Mars, as seeming to imply (which it does not in fact) that in order to abolish war, men must cease to be noble.
Base motives are, of course, among those which make up the forces that produce war. Base motives are among those which get great cathedrals built and hospitals constructed-contractors' profit-seeking, the vested interests of doctors and clergy. But Europe has not been covered by cathedrals because contractors wanted to make money, or priests wanted jobs.

“It is the mark of a truly educated man to know what not to read.”
“The truly civilized man has no enemies.”
The Smoke and the Flame: A Study in the Development of Religion (1902).

“And Covenants, without the Sword, are but Words, and of no strength to secure a man at all.”
The Second Part, Chapter 17, p. 85.
Leviathan (1651)
Context: For the Lawes of Nature (as Justice, Equity, Modesty, Mercy, and (in summe)doing to others, as wee would be done to,) of themselves, without the terrour of some Power, to cause them to be observed, are contrary to our naturall Passions, that carry us to Partiality, Pride, Revenge, and the like. And Covenants, without the Sword, are but Words, and of no strength to secure a man at all.

A Philosophy of Life (Lecture 35)
1930s, "New Introductory Lectures on Psycho-analysis" https://books.google.com/books/about/New_Introductory_Lectures_on_Psycho_anal.html?id=hIqaep1qKRYC&printsec=frontcover&source=kp_read_button#v=onepage&q&f=false (1933)
Source: New Introductory Lectures on Psychoanalysis

“Spirit is man's new power if he is to be truly mighty in his civilization.”
A Testament (1957)

1963, Remarks Prepared for Delivery at the Trade Mart in Dallas
Context: Our security and strength, in the last analysis, directly depend on the security and strength of others, and that is why our military and economic assistance plays such a key role in enabling those who live on the periphery of the Communist world to maintain their independence of choice. Our assistance to these nations can be painful, risky and costly, as is true in Southeast Asia today. But we dare not weary of the task. For our assistance makes possible the stationing of 3-5 million allied troops along the Communist frontier at one-tenth the cost of maintaining a comparable number of American soldiers.
“What truly makes a man who he is? Is it the strength of his arms, or the courage of his soul?”
Source: Drenai series, The Swords of Night and Day, Ch. 8
Context: What I did understand from the rebirth process was that the rebirth reproduced a physical duplicate of the original. But this is my point. It is physical. What truly makes a man who he is? Is it the strength of his arms, or the courage of his soul? You have your own soul, Harad. You are not Druss. Live your own life.