“It can be done!”
¡Sí se puede!
Personal motto later officially used by the United Farm Workers http://www.ufw.org/_page.php?menu=about&inc=about_vision.html
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Cesar Chavez 37
American farm worker, labor leader, and civil rights activi… 1927–1993Related quotes
“What men have done can still be done
And shall be done to-day.”
The Song of Abu Klea, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“Now a' is done that men can do,
And a' is done in vain.”
It Was A' for Our Rightfu' King, st. 2
Johnson's The Scots Musical Museum (1787-1796)

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

“[Visionaries] not only believed that the impossible can be done, but that it must be done.”
To create for the ages, let's combine art and engineering, Bran, Ferren, January 23, 2018, www.ted.com, March 2014 https://www.ted.com/talks/bran_ferren_to_create_for_the_ages_let_s_combine_art_and_engineering,

“A fundamental rule in technology says that whatever can be done will be done.”
Attributed to Andy Grove in: Ciarán Parker (2006) The Thinkers 50: The World's Most Influential Business. p. 70
New millennium