“Have I done something for the general interest? Well then I have had my reward. Let this always be present to thy mind, and never stop doing such good.”
XI, 4
Meditations (c. 121–180 AD), Book XI
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

Source: Everybody’s Autobiography (1937), Ch. 4

“The reward of a thing well done is to have done it.”
New England Reformers
Bartlett's Familiar Quotations, 10th ed. (1919), Essays, First Series

“If you want something you have never had, you must be willing to do something you have never done.”
Not found in Jefferson's writings, according to the Jefferson Monticello center https://www.monticello.org/site/research-and-collections/if-you-want-something-you-have-never-had-quotation. First known appearance in print is from 2004.
Misattributed
“If you want something you've never had you have to be willing to do something you've never done.”
Source: Life, the Truth, and Being Free (2010), p. 97

Comments on his final election defeat (11 August 1835) Ch. 2; in Dr. Swan's Prescriptions for Job-Itis (2003) by Dennis Swanberg and Criswell Freeman, p. 45, part of this seems to have become paraphrased as "Let your tongue speak what your heart thinks." No earlier publication of this version has been located.
Col. Crockett's Exploits and Adventures in Texas (1836)

“I do not wish any reward but to know I have done the right thing.”
Source: The Adventures of Huckleberry Finn

1980's, I don't necessarily desire a perfect photography,' 1981