“How well I know that loyalty brings disaster.”
Source: "Encountering Sorrow" (trans. David Hawkes), Line 21
Original
余固知謇謇之为患兮。
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Qu Yuan 7
ancient Chinese poet -343–-278 BCRelated quotes

“No one knows as well as I how much nonsense is printed in books.”
Source: Romancing Mister Bridgerton

"Special Message to the Congress on Federal Pay Reform (55)" (20 February 1962) http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations.aspx<!-- Public Papers of the President: John F. Kennedy, 1962 -->
1962
Context: The success of this Government, and thus the success of our Nation, depends in the last analysis upon the quality of our career services. The legislation enacted by the Congress, as well as the decisions made by me and by the department and agency heads, must all be implemented by the career men and women in the Federal service. In foreign affairs, national defense, science and technology, and a host of other fields, they face problems of unprecedented importance and perplexity. We are all dependent on their sense of loyalty and responsibility as well as their competence and energy.

“Well, if I were in charge, they would know that waterboarding is how we baptize terrorists.”
National Rifle Association annual convention, , quoted in [2014-04-27, Sarah Palin talks waterboarding, guns at NRA convention, Jake Miller, CBS News, http://www.cbsnews.com/videos/sarah-palin-waterboarding-is-how-we-baptize-terrorists/]
2014

Source: The Unabridged Journals of Sylvia Plath

“Hillary says she has been tested. Well, I hope so. You never know what Bill might bring home.”
Guest monologue on The Tonight Show http://www.hollywoodreporter.com/live-feed/jay-leno-takes-jimmy-fallons-867267, 17 February, 2016
The Tonight Show

“A man who knows how little he knows is well, a man who knows how much he knows is sick.”
The Way of Life, According to Laotzu, 1944.