“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
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
“You have not lived today until you have done something for someone who can never repay you.”
It – How Churches and Leaders Can Get It and Keep It (2008, Zondervan)
“Never interrupt someone doing something you said couldn't be done.”
As quoted in "She Drew Horses..." (2006) by Kelli Swan, p. 42
Disputed
Campaign speech in Michigan (1968) https://books.google.com/?id=uXRx5hGm8zYC&dq="Do+you+want+to+make+a+point+or+do+you+want+to+make+a+change"&pg=PA17
1960s
Part 2 “Aleph”, Chapter 3 (p. 68)
Against Infinity (1983)