“To sum it all up, I must say that I regret nothing.”
While awaiting trial in Israel, as quoted in LIFE magazine (5 December 1960).
Help us to complete the source, original and additional information
Adolf Eichmann 62
German Nazi SS-Obersturmbannführer 1906–1962Related quotes
How Children Learn (1967).

“I summed up all systems in a phrase, and all existence in an epigram.”
Written in a letter from Reading Prison to Lord Alfred Douglas in early 1897

Bold & Delicious
Lyrics, (Miss)Understood

What's Wrong with this Pillow? http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHTOAD000042000004000009000001&idtype=cvips&gifs=Yes by N. David Mermin, Cornell University, Physics Today, April 1989, page 9, doi:10.1063/1.2810963
Misattributed to Richard Feynman, by Matthew effect.
Attribution discussed in: Could Feynman Have Said This? http://scitation.aip.org/journals/doc/PHTOAD-ft/vol_57/iss_5/10_1.shtml by N. David Mermin, Physics Today, May 2004, page 10 ( DOC http://web.archive.org/web/20040929192449/http://www.fisica.unlp.edu.ar/materias/FisGral2/PhysicsToday/PhysicsTodayMay2004ReferenceFrame.doc)

“I am enjoying existence as much as ever, and regret nothing.”
His last letter, to Myron Benton (31 March 1862) http://www.walden.org/Institute/thoreau/writings/correspondence/1862_03_21_Benton.htm
Context: You ask particularly after my health. I suppose that I have not many months to live; but, of course, I know nothing about it. I may add that I am enjoying existence as much as ever, and regret nothing.

“In looking back, I see nothing to regret, and little to correct.”
Letter to Duff Green (10 February 1844), in Correspondence of John C. Calhoun (1900) edited by William Pinkney Starke, p. 569
1840s
Context: I cannot think in the present state of parties of entering again on the political arena. I would but waste my strength and exhaust my time, without adding to my character, or rendering service to the country, or advancing the cause for which I have so long contended. I feel no disgust nor do I feel disposed to complain of any one. On the contrary, I am content, and willing to end my public life now. In looking back, I see nothing to regret, and little to correct. My interest in the prosperity of the country, and the success of our peculiar and sublime political system when well understood, remain without abatement, and will do so till my last breath; and I shall ever stand prepared to serve the country, whenever I shall see reasonable prospect of doing so.