Theodore Roosevelt Quote
Right here let me make as vigorous a plea as I know how in favor of saying nothing that we do not mean, and of acting without hesitation up to whatever we say. A good many of you are probably acquainted with the old proverb: "Speak softly and carry a big stick—you will go far." If a man continually blusters, if he lacks civility, a big stick will not save him from trouble; and neither will speaking softly avail, if back of the softness there does not lie strength, power.
The Strenuous Life: Essays and Addresses (1900) - National Duties