“Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
The quote "Twenty years from now you will be more disappointed by the things you didn't do than by t…" is famous quote attributed to Mark Twain (1835–1910), American author and humorist.
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
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Mark Twain 637
American author and humorist 1835–1910Related quotes

Mirkka Rekola, Kuka lukee kanssasi (Who is Reading with You), 1990; Translated by Sari Hantula. Quoted at Mirkka Rekola http://www.electricverses.net/sakeet.php?poet=22&poem=645&language=3, at electricverses.net, accessed 20-03-2017.

“When you can’t change the direction of the wind — adjust your sails”

Bridge over Troubled Water
Song lyrics, Bridge over Troubled Water (1970)

This saying appears to be due to John Augustus Shedd; it was quoted in "Grace Hopper : The Youthful Teacher of Us All" by Henry S. Tropp in Abacus Vol. 2, Issue 1 (Fall 1984) ISSN 0724-6722 . She did repeat this saying on multiple occasions, but she called it "a motto that has stuck with me" and did not claim coinage. Additional variations and citations may be found at Quote Investigator http://quoteinvestigator.com/2013/12/09/safe-harbor/
Misattributed
Small is Beautiful: A Study of Economics As If People Mattered (1973)

A Pirate Looks at Forty
Song lyrics, A1A (1974)