Charles de Gaulle, War Memoirs, 1960:
“Deliberation is a function of the many; action is the function of one.”
Attributed to Will Rogers:
“Even if you’re on the right track, you’ll get run over if you just sit there.”
And there is always:
“Don’t just sit there, do something.”
This last one is such a common admonition that I can’t find out who coined it. Any thoughts?