“Take time to deliberate; but when the time for action arrives, stop thinking and go in.”
Quoted as "a maxim of Gen. Jackson's" in Supplement to the Courant Vol. XXII No. 25, Hartford, Saturday, December 12, 1857, p. 200 books.google http://books.google.de/books?id=0uIRAAAAYAAJ&pg=PA200&dq=deliberate
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