Everyone knows "speak softly and carry a bit stick", as people remind me on Hillary's Iran comment, but here are a few others worth noting. (There are more, Google them. Better yet, read his speeches and ideas).
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Teddy Roosevelt:

"The unforgivable crime is soft hitting. Do not hit at all if it can be avoided; but never hit softly."

"Wars are, of course, as a rule to be avoided; but they are far better than certain kinds of peace. "

"I took the Canal Zone and let Congress debate; and while the debate goes on, the canal does also."

"In any moment of decision, the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing."

"It behooves every man to remember that the work of the critic is of altogether secondary importance, and that, in the end, progress is accomplished by the man who does things."

"The most successful politician is he who says what everybody is thinking most often and in the loudest voice."

"The pacifist is as surely a traitor to his country and to humanity as is the most brutal wrongdoer."

"The things that will destroy America are prosperity-at-any-price, peace-at-any-price, safety-first instead of duty-first, the love of soft living, and the get-rich-quick theory of life. "

When they call the roll in the Senate, the Senators do not know whether to answer "Present" or "Not guilty."

When you are asked if you can do a job, tell 'em, 'Certainly I can!' Then get busy and find out how to do it.