“I do not agree that the dog in a manger has the final right to the manger even though he may have lain there for a very long time. I do not admit that right.”
To the Peel Commission (1937) on a Jewish Homeland in Palestine.
The 1930s
Context: I do not agree that the dog in a manger has the final right to the manger even though he may have lain there for a very long time. I do not admit that right. I do not admit for instance, that a great wrong has been done to the Red Indians of America or the black people of Australia. I do not admit that a wrong has been done to these people by the fact that a stronger race, a higher-grade race, a more worldly wise race to put it that way, has come in and taken their place.
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Winston S. Churchill 601
Prime Minister of the United Kingdom 1874–1965Related quotes
The Dragon Queen

“I will argue for the right of the electorate to vote on any deal that is finally agreed.”
Diane Abbott: Listen to CBI and NHS' on Brexit migration https://www.bbc.co.uk/news/uk-politics-42384346 BBC News (17 December 2017)
2010s, 2017

As quoted and paraphrased in "I Have Been a Babe and a Boob" by Joe Winkworth, in Collier's (October 31, 1925), p. 15
Context: "I am through—through with the pests and the good-time guys. Between them and a few crooks I have thrown away more than a quarter of a million dollars. I have been a Babe—and a Boob. I'm through." [Ruth] confesses he faces either oblivion or the hard task of complete reformation. [He] realizes that he must make good all over again. "I am going to do it," he said. "I was going to be the exception, the popular hero who could do as he pleased. But all those people were right. Babe and Boob—that was me all over. Now, though, I know that if I am to wind up sitting pretty on the world I've got to face the facts and admit I have been the sappiest of saps. All right, I admit it. I haven't any desire to kid myself."

“Do what is right, though the world may perish.”
This is quoted as Kant in Building Academic Language: Essential Practices for Content Classrooms, Grades 5-12 (2007) by Jeff Zwiers, p. 202, but apparently derives from Kant's arguments in support of the far older Latin proverb Fiat iustitia, pereat mundus — "Do what is right though the world should perish." which was the subject of an essay: "Kant on the Maxim 'Do What Is Right Though the World Should Perish'" by Sissela Bok, in Argumentation 2 (February 1988). There was also a similar latin proverb Fiat iustitia ruat caelum — Let justice be done though the heavens fall.
Misattributed

Press conference March 1st http://www.npr.org/blogs/thetwo-way/2013/03/01/173240651/decrying-dumb-arbitrary-cuts-obama-says-we-will-get-through-this
2013
Source: The Christian Agnostic (1965), p.236-237 [ellipsis added]

“I am in the right place, at the right time, doing the right thing.”
Variant: I am in the right place at the right time, doing the right thing.

Interview on Charlie Rose https://archive.org/details/WHUT_20100614_130000_Charlie_Rose (2000)