“What would I do if Alex wasn't around? I would have no one to keep me on my toes or to fight. So of course I am pleased he changed his mind. I enjoy our rivalry. It is good for Arsenal, good for Manchester United and good for both of us.”

Attributed by Thomas Babington Macaulay, Life of Frederick the Great (1882), pg 48.
Repeated by Thomas Babington Macaulay in a review of "Frederick the Great and his Times. Edited, with an Introduction, by Thomas Campbell, Esq". Edinburgh Review, ISSN 1751-8482, 04/1842, Volume 75, Issue 151, p. 241-242, though it does not appear in the original work.
Knowles, Oxford Dictionary Of Quotations (5th Edition) (Oxford University Press, 1999)
Attributed

Letter to Leopold Mozart (Mannheim, 2 February 1778), from The letters of Wolfgang Amadeus Mozart, 1769-1791, translated, from the collection of Ludwig Nohl, by Lady [Grace] Wallace (Oxford University Press, 1865, digitized 2006) vol. I, # 91 (p. 164) http://books.google.com/books?vid=0SGwLiCNxu7qZ5ch&id=KEgBAAAAQAAJ&printsec=titlepage&dq=%22The+letters+of+Wolfgang+Amadeus+Mozart,+1769-1791%22&hl=en#PRA1-PA164,M1

http://redflagflyinghigh.com/2011/05/blogs/scholes-tribute-the-worlds-top-players-on-the-ginger-prince
Pep Guardiola

Quoted in Frances Stevenson's diary entry (11 March 1919), A. J. P. Taylor (ed.), Lloyd George: A Diary (London: Hutchinson, 1971), p. 171
Prime Minister

Discussing New Year's resolutions. From The Morning Call http://www.mcall.com/entertainment/zap-celeb-new-years-resolutions-2011-pics,0,7643845.photogallery, 5 January 2011

As quoted in "The Scoreboard" https://news.google.com/newspapers?id=DsQbAAAAIBAJ&sjid=pU8EAAAAIBAJ&pg=5159%2C3057259&dq=roberto-clemente-recently-asked-best-hank-aaron-everything by Les Biederman, in The Pittsburgh Press (Tuesday, December 26, 1967), p. 40
Baseball-related, <big><big>1960s</big></big>, <big>1967</big>

2010s, 2015, Presidential Bid Announcement (June 16, 2015)

Brandon Flowers on what song would be playing if he went to hell. (2005) ( Rolling Stone Magazine http://www.rollingstone.com/news/story/_/id/7235375/thekillers?pageid=rs.Artistcage&pageregion=triple3)

2014, Young Southeast Asian Leaders Initiative Town Hall Speech (November 2014)
Context: I’m very proud of the United States. I believe that the United States is a force for good around the world. But I wouldn’t be a good President if I don’t listen to criticism of our policies and stay open to what other countries say about us. Sometimes I think those criticisms are unfair. Sometimes I think people like to complain about the United States because we’re doing too much. Sometimes they complain because they’re doing too little. Every problem around the world, why isn’t the United States doing something about it. Sometimes there are countries that don’t take responsibility for themselves and they want us to fix it. And then when we do try to fix it, they say why are you meddling in our affairs. Yes, it’s kind of frustrating sometimes. But the fact that we are getting these criticisms means that we’re constantly thinking, okay, is this how we should apply this policy? Are we doing the right thing when we provide aid to a country, but the country is still ruled by a small elite and maybe it’s not getting down to the people? Are we doing the right thing when we engage in training a military to become more professional, but maybe the military is still engaging in repressive activity? If we’re not open to those criticisms, then we won’t get better, we won’t improve.