„I have learnt through bitter experience the one supreme lesson to conserve my anger, and as heat conserved is transmuted into energy, even so our anger controlled can be transmuted into a power which can move the world.“
Young India (15 September 1920), reprinted in Collected Works of Mahatma Gandhi, Vol. 21 (electronic edition), p. 252.
1920s
Related quotes

„To anger a conservative, lie to him. To anger a liberal, tell him the truth.“
— Theodore Roosevelt American politician, 26th president of the United States 1858 - 1919
First attributed to Roosevelt on the internet in recent years, there is no evidence he ever said this, as noted in "Teddy Roosevelt on Conservatives vs. Liberals", by Dan Evon at snopes.com (3 June 2016) http://www.snopes.com/teddy-roosevelt-anger-a-liberal-quote and at Teddy Roosevelt once said, “To anger a conservative, lie to him. To anger a liberal, tell him the truth.” (14 June 2016) https://www.truthorfiction.com/teddy-roosevelt-anger-conservative-lie-quote
Misattributed

— Spider Robinson, book Callahan's Crosstime Saloon
Source: Callahan's Crosstime Saloon (1977) "Laws of Conservation of Pain and Joy"

— El Lissitsky Soviet artist, designer, photographer, teacher, typographer and architect 1890 - 1941
quote, p. 384
posthumous publications, El Lissitzky, El Lissitzky : Life, Letters, Texts (1967; 1980)

— E.M. Forster, book A Room with a View
Source: A Room with a View (1908), Ch. 19
Context: It isn’t possible to love and to part. You will wish that it was. You can transmute love, ignore it, muddle it, but you can never pull it out of you. I know from experience that the poets are right: love is eternal.

— Audre Lorde writer and activist 1934 - 1992
"The Uses of Anger"
Sister Outsider: Essays and Speeches (1984)

— Mitt Romney American businessman and politician 1947
2016, Remarks on Donald Trump and the 2016 race

— Harry Emerson Fosdick American pastor 1878 - 1969
“Shall the Fundamentalists Win?” in Christian Work #102 (10 June 1922), p. 716–722 http://historymatters.gmu.edu/d/5070/
Context: Already all of us must have heard about the people who call themselves the Fundamentalists. Their apparent intention is to drive out of the evangelical churches men and women of liberal opinions. I speak of them the more freely because there are no two denominations more affected by them than the Baptist and the Presbyterian. We should not identify the Fundamentalists with the conservatives. All Fundamentalists are conservatives, but not all conservatives are Fundamentalists. The best conservatives can often give lessons to the liberals in true liberality of spirit, but the Fundamentalist program is essentially illiberal and intolerant.

— Henri Poincaré, book The Value of Science
Comme nous ne pouvons pas donner de l'énergie une définition générale, le principe de la conservation de l'énergie signifie simplement qu'il y a quelque chose qui demeure constant.
Source: The Value of Science (1905), Ch. 10: Is Science artificial?

„Controls them and subdues, transmutes, bereaves
Of their bad influence, and their good receives.“
— William Wordsworth English Romantic poet 1770 - 1850
Source: Character of the Happy Warrior http://www.bartleby.com/145/ww302.html (1806), Line 17.

— Charles Lyell British lawyer and geologist 1797 - 1875
Source: The Geological Evidences of the Antiquity of Man (1863), Ch.20, p. 406
Context: No one can believe in transmutation who is not profoundly convinced that all we know in paleontology is as nothing compared to what we have yet to learn, and they who regard the record as so fragmentary, and our acquaintance with the fragments which are extant as so rudimentary, are apt to be astounded at the confidence placed by the progressionists in data which must be defective in the extreme. But exactly in proportion as the completeness of the record and our knowledge of it are overrated, in that same degree are many progressionists unconscious of the goal towards which they are drifting. Their faith in the fullness of the annals leads them to regard all breaks in the series of organic existence, or in the sequence of the fossiliferous rocks, as proofs of original chasms and leaps in the course of nature, signs of the intermittent action of the creational force, or of catastrophes which devastated the habitable surface; and they are therefore fearless of discovering any continuity of plan (except that which must have existed in the Divine mind) which would imply a material connection between the outgoing organisms and the incoming ones.
— Reginald Maudling British politician 1917 - 1979
The Times (26 April, 1976).

— Toni Morrison American writer 1931 - 2019
Interview with Don Swaim (1987) http://wiredforbooks.org/tonimorrison/
Context: Anger... it's a paralyzing emotion... you can't get anything done. People sort of think it's an interesting, passionate, and igniting feeling — I don't think it's any of that — it's helpless... it's absence of control — and I need all of my skills, all of the control, all of my powers — and I need clarity, in order to write — and anger doesn't provide any of that — I have no use for it whatsoever. I can feel melancholy, and I can feel full of regret, but anger is something that is useful to the people who watch it... it's not useful to me.
— Martin Cecil, 7th Marquess of Exeter Marquess of Exeter 1909 - 1988
On Eagle's Wings, 1977, p. 118
As of a Trumpet, On Eagle's Wings

„You can sense their anger before they even say a word.“
— Ben Carson 17th and current United States Secretary of Housing and Urban Development; American neurosurgeon 1951
Source: Take The Risk (2008), p. 77