“I don't know how to lie. But I don't know what truth is, either. I always try to speak the way I think will cause least trouble to God and men.”
Ólafur talking to Vegmey
Heimsljós (World Light) (1940), Book Two: The Palace of the Summerland
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Halldór Laxness 216
Icelandic author 1902–1998Related quotes

“If I don't know I don't know
I think I know
If I don't know I know
I think I don't know”
§3, p. 55
Knots (1970)

“I don't think anyone really knows how to help everyone. I don't even know what's best for me.”
2010s, I don't know, so I'm an atheist libertarian (2011)
Context: What makes me libertarian is what makes me an atheist — I don't know. If I don't know, I don't believe. I don't know exactly how we got here, and I don't think anyone else does, either. We have some of the pieces of the puzzle and we'll get more, but I'm not going to use faith to fill in the gaps. I'm not going to believe things that TV hosts state without proof. I'll wait for real evidence and then I'll believe.
And I don't think anyone really knows how to help everyone. I don't even know what's best for me.

As quoted in "Interview with Shepard Smith" https://web.archive.org/web/20120501134518/http://www.esquire.com/features/shepard-smith-fox-news-0309-2 (February 10, 2009), by Tom Junod, Esquire, Hearst Communications Inc.
2000s

“I don't know what I feel or what I want to feel. I don't know what to think or what I am.”
Source: The Book of Disquiet

Wilmington News-Journal
2006-11-12

“I don't know what effect these men will have on the enemy, but by God, they terrify me.”
Said to be his remarks on a draft of new troops sent to him in Spain (1809), as quoted in A New Dictionary of Quotations on Historical Principles from Ancient and Modern Sources (1942) by H. L. Mencken, this quote is disputed, and may be derived from a comment made to Colonel Robert Torrens about some of his generals in a despatch (29 August 1810): "As Lord Chesterfield said of the generals of his day, "I only hope that when the enemy reads the list of their names, he trembles as I do."
Disputed