“Most people are bothered by those passages of Scripture they do not understand, but the passages that bother me are those I do understand.”
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Mark Twain 637
American author and humorist 1835–1910Related quotes
Ride the River (1983), Ch. 5
Context: Do not let yourself be bothered by the inconsequential. One has only so much time in this world, so devote it to the work and the people most important to you, to those you love and things that matter. One can waste half a lifetime with people one doesn't really like, or doing things when one would be better off somewhere else.

“She didn't bother to understand it all; it was--boring boring boring.”
Source: The Looking Glass Wars

Source: via Twitter Tweet https://twitter.com/AOC/status/1457374737722654725 (November 7, 2021)

“I am not bothered by the fact that I am not understood. I am bothered when I do not know others.”
Source: The Analects, Chapter I

“Those who know, do. Those that understand, teach.”
This and many similar quotes with the same general meaning are misattributed to Aristotle as a result of Twitter attribution decay. The original source of the quote remains anonymous. The oldest reference resides in the works of George Bernard Shaw, Man and Superman (1903): "Maxims for Revolutionists", where he claims that “He who can, does. He who cannot, teaches.”. However, the related quote, "Those who can, do. Those who understand, teach" likely originates from Lee Shulman in his explanation of Aristotlean views on professional mastery: Source: Shulman, L. S. (1986). Those who understand: Knowledge growth in teaching. Educational Researcher, 15(2), 4 - 14. Stable URL: http://www.jstor.org/stable/1175860
Misattributed
Variant: Those who can, do, those who cannot, teach.