"Think, then act" is the Mantra of "the strategy boys."
I've long been an "act, then think" guy.
"Ready. Fire. Aim."—Ross Perot. "How do I know what I think until I see what I say?"—E.M. Forster. "Innovation is the reaction to the prototype."—Michael Schrage, Media Lab, MIT, innovation guru.
As you might guess, I loved this quote I found on the "Thoughts" page of Forbes (04.09.07):
"'I think therefore I am' is the statement of an intellectual who underrates toothaches."—Milan Kundera