“Have strength in yourself always. think and remember not just what you should do, but also what you want to do. (Ageha, Basara, Vol. 13)”
Source: Basara, Vol. 13
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Yumi Tamura 2
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Ray Dalio, [Principles: Life and Work, https://books.google.com/books?id=6LGuDgAAQBAJ&pg=PR7, xi, 19 September 2017, Simon & Schuster, 978-1-5011-2405-1]
Principles: Life and Work (2017)

Think for Yourself (1965)
Lyrics

“Everything passes,
Everything changes,
Just do what you think you should do.”

Express Yourself Fully (page 8)
Not Always So, practicing the true spirit of Zen (2002)

Original: (it) Ogniqualvolta dovessi dubitare di ciò che stai facendo, ricorda di amare ciò che hai. Ricorda di amare ciò che fai. Ricorda di amare ciò che dai.
Source: prevale.net

“Make sure you are doing what God wants you to do—then do it with all your strength.”
This saying is not found in any source before 2010, when it was posted by The Ignorant Fisherman at Free Republic http://www.freerepublic.com/focus/bloggers/2451682/posts on 15 February. The language is not that of Washington or his time.
Misattributed, Spurious attributions
Source: As quoted in "Voicing With a Heart"