“I see it all perfectly; there are two possible situations — one can either do this or that. My honest opinion and my friendly advice is this: do it or do not do it — you will regret both.”

At the program Câmera Aberta at Band on 23 May 1999. O dia que Bolsonaro quis matar FHC, sonegar impostos e declarar guerra civil http://www.gazetadopovo.com.br/politica/republica/o-dia-que-bolsonaro-quis-matar-fhc-sonegar-impostos-e-declarar-guerra-civil-8mtm0u0so6pk88kqnqo0n1l69. Gazeta do Povo (10 October 2017).

Marry, and you will regret it; don’t marry, you will also regret it; marry or don’t marry, you will regret it either way. Laugh at the world’s foolishness, you will regret it; weep over it, you will regret that too; laugh at the world’s foolishness or weep over it, you will regret both. Believe a woman, you will regret it; believe her not, you will also regret it… Hang yourself, you will regret it; do not hang yourself, and you will regret that too; hang yourself or don’t hang yourself, you’ll regret it either way; whether you hang yourself or do not hang yourself, you will regret both. This, gentlemen, is the essence of all philosophy.
Source: Either/Or

Response to the closing question of whether she hadn't "indeed come to the conclusion that your conduct and the actions along with your brother and other persons in the present phase of the war should be seen as a crime against the community, but in particular against our troops fighting arduously in the east, that merits the severest sentence?" in the official examination transcripts (February 1943); Bundesarchiv Berlin, ZC 13267, Bd. 3 http://www.bpb.de/themen/5H3ZT3,3,0,Ausz%FCge_aus_den_Verh%F6rprotokollen_von_Sophie_Scholl.html#art3

Letter to Lord Lauderdale (18 November 1802), quoted in L. G. Mitchell, Charles James Fox (London: Penguin, 1997), p. 177.
1800s

Source: The Heart is a Lonely Hunter

Annotation: It's unclear, whether this quote is from Hanyu himself or based on a commercial script, but it's commonly attributed to him.
Original: (ja) できなかったら、できるまでやる。できるようになったら、完璧にできるまでやる。完璧にできるようになったら、何度でも、完璧にできるまでやる。
Source: Attributed, Lines from a TV commercial for 味の素 アミノバイタル (AJINOMOTO amino VITAL), released on 1 October 2014, as quoted in フィギュアスケート14-15シーズン序盤号, published on 15 November 2014 by 日刊スポーツ新聞社 (Nikkan Sports News).

letter of resignation to Queen Elizabeth II

Source: Take The Risk (2008), p. 21

Source: Abandon