“Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do.”
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Mark Twain 637
American author and humorist 1835–1910Related quotes

This quote has been attributed to Mark Twain, but the attribution cannot be verified. The quote should not be regarded as authentic. — Twainquotes http://www.twainquotes.com/Discovery.html
Actually from the 1990 book P. S. I Love You' https://books.google.com/books?id=5OORXU6rlGIC&q=bowlines#v=onepage&q=bowlines&f=false' by H. Jackson Brown.
Misattributed

"Elements of Success", as published in President Garfield and education: Hiram college memorial https://archive.org/details/presidentgarfiel00hinsuoft (1882), compiled by B. A. Hinsdale, p. 327

"Kozmic Blues", co-written with Gabriel Mekler
I Got Dem Ol' Kozmic Blues Again Mama! (1969)

“Now I want you to tell me just one thing more. Why do you hate the South?”
"I dont hate it," Quentin said, quickly, at once, immediately; "I dont hate it," he said. I dont hate it he thought, panting in the cold air, the iron New England dark: I dont. I dont! I dont hate it! I dont hate it!
last lines (Chapter 9)
Absalom, Absalom! (1936)