“It's done, when it's done.”
Referring to Doom 3, Quoted in John Carmack Biography http://www.biographybase.com/biography/Carmack_John.html.
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John D. Carmack 31
American computer programmer, engineer, and businessman 1970Related quotes
“When a thing's done, it's done, and if it's not done right, do it differently next time.”
Swallowdale (Chapter 8), 1931
“How does something immoral, when done privately, become moral when it is done collectively?”
1980s, All It Takes is Guts: A Minority View (1987)
Context: How does something immoral, when done privately, become moral when it is done collectively? Furthermore, does legality establish morality? Slavery was legal; apartheid is legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of moral people.

“Great things are done when men and mountains meet;
This is not done by jostling in the street.”
Great Things Are Done
1800s, Poems from Blake's Notebook (c. 1807-1809)

“When a thing is done, it's done. Don't look back. Look forward to your next objective.”
As quoted in "George C. Marshall and the Marshall Plan: A Model of Transformational Diplomacy" (2005) by Tom Callahan http://web.archive.org/web/20050616023457/http://www.state.gov/r/pa/dc/rks/47848.htm

Memoirs, Volume Two
Source: NB: ghost-written post-mortem by Munro and Inglis

“When all is said and done, there is usually more said than done.
[as quoted by Alfred E Neuman]”
Variant: When all is said and done, more is said than done.