“It is realized that if there is to be peace in the world, it must be attained through men and with man, in his nature and mores, just about as he now is. Intensive effort is exerted to reach the hearts and minds of men with the vital pleas for peace and human understanding, to the end that human attitudes and relations may be steadily improved. But this is a process of international education, or better, education for international living, and it is at best gradual. Men change their attitudes and habits slowly, and but grudgingly divorce their minds from fears, suspicions, and prejudices.”

LDS General Conference (October 1964)
Context: The rising sun can dispel the darkness of night, but it cannot banish the blackness of malice, hatred, bigotry, and selfishness from the hearts of humanity. Happiness and peace will come to earth only as the light of love and human compassion enter the souls of men.
It was for this purpose that Christ, the Son of righteousness, 'with healing in his wings,' came in the Meridian of Time. Through him wickedness shall be overcome, hatred, enmity, strife, poverty, and war abolished. This will be accomplished only by a slow but never-failing process of changing men's mental and spiritual attitude. The ways and habits of the world depend upon the thoughts and soul-convictions of men and women. If, therefore, we would change the world, we must first change people's thoughts. Only to the extent that men desire peace and brotherhood can the world be made better. No peace even though temporarily obtained, will be permanent, whether to individuals or nations, unless it is built upon the solid foundation of eternal principles.

Address at Cornell College, Mount Vernon, Iowa (15 October 1962) https://news.cornellcollege.edu/dr-martin-luther-kings-visit-to-cornell-college/; also quoted in Wall Street Journal (13 November 1962), Notable & Quotable , p. 18
Variant:
It is true that behavior cannot be legislated, and legislation cannot make you love me, but legislation can restrain you from lynching me, and I think that is kind of important.
Address at Finney Chapel, Oberlin College (22 October 1964), as reported in "When MLK came to Oberlin" by Cindy Leise, The Chronicle-Telegram (21 January 2008)
1960s

Napoleon : In His Own Words (1916)

Message to the White House, April 1977, as quoted in The Shah's Story, page 67-68
Speeches, 1977

Crime : Its Cause And Treatment (1922) Ch. 36 "Remedies"
Context: It is often said that the accused should be given an immediate trial; that this and subsequent proceedings should not be hindered by delay; that the uncertainties of punishment furnish the criminal with the hope of escape and therefore do not give the community the benefit of the terror that comes with the certainty of punishment that could prevent crime. I can see no basis in logic or experience for this suggestion. It is based on the theory that punishment is not only a deterrent to crime, but the main deterrent. It comes from the idea that the criminal is distinct from the rest of mankind, that vengeance should be sure and speedy and that then crime would be prevented. If this were true and the only consideration to prevent crime, then the old torture chamber and the ancient prison with all its hopelessness and horror should be restored. Logic, humanity and experience would protest against this. If there is to be any permanent improvement in man and any better social order, it must come mainly from the education and humanizing of man. I am quite certain that the more the question of crime and its treatment is studied the less faith men have in punishment.

"Homo Sum." Being a Letter to an Anti-Suffragist from an Anthropologist, 1900, p. 30 https://archive.org/details/homosumbeinglett00harruoft/page/30

"Man alone, of all creatures of earth, can change his thought pattern and become the architect of his destiny." Actually said by Spencer W. Kimball, twelfth president of The Church of Jesus Christ of Latter-day Saints, in his Miracle of Forgiveness (1969), p. 114. This predates any of the misquotations.
Other forms: "The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind." This is also misattributed to Albert Schweitzer.
James did say: "As life goes on, there is a constant change of our interests, and a consequent change of place in our systems of ideas, from more central to more peripheral, and from more peripheral to more central parts of consciousness."
Misattributed
Context: Man alone, of all the creatures on earth, can change his own patterns. Man alone is the architect of his destiny. The greatest revolution in our generation is the discovery that human beings, by changing the inner attitudes of their minds, can change the outer aspects of their lives … It is too bad that most people will not accept this tremendous discovery and begin living it.

Remaking the world, The Speeches of Frank N.D. Buchman, Blandford Presss 1947, revised 1958, p. 3
Moral attitude