“Be mild and firm. Apply your best exertions to put us in a proper posture of defense.”

No. 225.
The Tatler (1711–1714)
Context: The discreet man finds out the talents of those he converses with, and knows how to apply them to proper uses. Accordingly, if we look into particular communities and divisions of men, we may observe that it is the discreet man, not the witty, nor the learned, nor the brave, who guides the conversation, and gives measures to the society.

As recalled by Rebecca R. Pomroy in Echoes from hospital and White House (1884), by Anna L. Boyden, p. 61 http://books.google.com/books?id=7LZiAAAAMAAJ&pg=PA61&dq=feet
Posthumous attributions
Variant: Be sure you put your feet in the right place, then stand firm.

in his review of Joseph Beskiba's textbook, published in the Österreichische Blätter für Literatur und Kunst (September 7, 1844), as quoted by [Peter Schuster, Moving the stars: Christian Doppler, his life, his works and principle, and the world after, Living edition, 2005, 3901585052, 78]

Song lyrics, Ophelia (1998), Ophelia

History of the Thirty Years War - Volume II
The Thirty Years War

Context: The tank, the B-52, the fighter-bomber, the state-controlled police and military are the weapons of dictatorship. The rifle is the weapon of democracy. Not for nothing was the revolver called an "equalizer." Egalite implies liberte. And always will. Let us hope our weapons are never needed — but do not forget what the common people of this nation knew when they demanded the Bill of Rights: An armed citizenry is the first defense, the best defense, and the final defense against tyranny.

Abbey's Road (1979)

Good to Great: Why Some Companies Make the Leap... and Others Don't