“I've done it, be of good cheer.”
Western European nobility » Maarten Harpertsz. "Maarten" Tromp (1598-1653) https://www.genealogieonline.nl/en/west-europese-adel/I157344.php Tromp's last words.
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Maarten Harpertszoon Tromp 1
Dutch admiral 1598–1653Related quotes
“I've done bad things with relish, and good things with pickles.”
"Ennui"
Lyrics, The Psychopathology of Everyday Life (2003)

Interview, 1969 http://www.rogerebert.com/interviews/interview-with-kirk-douglas

“I've done a good deed. I gave that little twit his soul back. Wasn't that generous?”
Bedazzled (1967)

As quoted in The Oxford Dictionary of Literary Quotations (1997) edited by Peter Kemp, p. 303

“Cheerfulness and good nature, purge hatred and rancour.”
Muhammad Kulayni, Usul al-Kafi, vol.3, p. 162.
General

“Be cheerful, do good, and let the sparrows chirp.”
Source: http://www.jugendherberge.de/en/youth-hostels/benediktbeuern%20don%20bosco205/leisure%20activities

“The saloon is a liar. It promises good cheer and sends sorrow.”
Source: Billy Sunday Quotes http://www.youtube.com/watch?v=JAfeTcqGTJA / www.famousquotes.com