“Through the broad extent of country over which you have marched by your respect for the rights and property of citizens, you have shown that you were soldiers not only to defend but able and willing to defend and protect.”

As quoted in Autobiography and Personal Reminiscences of Major-General Benj. F. Butler https://books.google.com/books?id=0LIBAAAAMAAJ&pg=PA604 (1892), pp. 604–605

1990s, Letter to Patrick Leahy (1999)

Source: Academy Series - Priscilla "Hutch" Hutchins, Omega (2003), Chapter 33 (p. 348)

Nahj al-Balagha

No. 11
The Federalist Papers (1787–1788)
Context: The rights of neutrality will only be respected, when they are defended by an adequate power. A nation, despicable by its weakness, forfeits even the privilege of being neutral.

Not found in Augustine's works, it is stated in Fauxtations: Because sometimes the Internet is wrong : St. Augustine: The Truth is Like a Lion (18 October 2015) https://fauxtations.wordpress.com/2015/10/18/st-augustine-the-truth-is-like-a-lion/, that this is very likely a summary derived from statements of Charles Haddon Spurgeon about the "Word of God" or "the pure gospel", and the Bible:
:: The Word of God can take care of itself, and will do so if we preach it, and cease defending it. See you that lion. They have caged him for his preservation; shut him up behind iron bars to secure him from his foes! See how a band of armed men have gathered together to protect the lion. What a clatter they make with their swords and spears! These mighty men are intent upon defending a lion. O fools, and slow of heart! Open that door! Let the lord of the forest come forth free. Who will dare to encounter him? What does he want with your guardian care? Let the pure gospel go forth in all its lion-like majesty, and it will soon clear its own way and ease itself of its adversaries.
::* The Lover of God’s Law Filled with Peace (January 1888)
: and the earlier:
:: There seems to me to have been twice as much done in some ages in defending the Bible as in expounding it, but if the whole of our strength shall henceforth go to the exposition and spreading of it, we may leave it pretty much to defend itself. I do not know whether you see that lion — it is very distinctly before my eyes; a number of persons advance to attack him, while a host of us would defend the grand old monarch, the British Lion, with all our strength. Many suggestions are made and much advice is offered. This weapon is recommended, and the other. Pardon me if I offer a quiet suggestion. Open the door and let the lion out; he will take care of himself. Why, they are gone! He no sooner goes forth in his strength than his assailants flee. The way to meet infidelity is to spread the Bible. The answer to every objection against the Bible is the Bible.
::* Speech at the Annual Meeting of the British and Foreign Bible Society "The Bible" (5 May 1875), in Speeches by C. H. Spurgeon at Home and Abroad (1878) edited by G.H. Pike https://books.google.com/books?id=j_0CAAAAQAAJ&pg=PA17&lpg=PA17#v=onepage&q&f=false
Misattributed

Source: The Friends of Voltaire (1906), Ch. 7 : Helvetius : The Contradiction, p. 199; because of quote marks around the original publication of these words, they are often attributed to Voltaire, though Hall was not actually quoting him but summarizing his attitude with the expression. The statement was widely popularized when misattributed to Voltaire as a "Quotable Quote" in Reader's Digest (June 1934), but in response to the misattribution, Hall had been quoted in Saturday Review (11 May 1935), p. 13, as stating: I did not mean to imply that Voltaire used these words verbatim and should be surprised if they are found in any of his works. They are rather a paraphrase of Voltaire's words in the Essay on Tolerance — "Think for yourselves and let others enjoy the privilege to do so too."
The paragraph in which the statement first appears reads:
Context: 'What a fuss about an omelette!' he had exclaimed when he heard of the burning. How abominably unjust to persecute a man for such an airy trifle as that! "I disapprove of what you say, but I will defend to the death your right to say it," was his attitude now.

Variants:
Monsieur l’abbé, I detest what you write, but I would give my life to make it possible for you to continue to write.
I wholly disapprove of what you say—and will defend to the death your right to say it.
Though these words are regularly attributed to Voltaire, they were first used by Evelyn Beatrice Hall, writing under the pseudonym of Stephen G Tallentyre in The Friends of Voltaire (1906), as a summation of Voltaire's beliefs on freedom of thought and expression. http://books.google.it/books?id=j3kGAQAAIAAJ&q=%22I+disapprove+of+what+you+say,+but+I+will+defend+to+the+death+your+right+to+say+it%22+intitle:%22The+Friends+of+Voltaire%22&dq=%22I+disapprove+of+what+you+say,+but+I+will+defend+to+the+death+your+right+to+say+it%22+intitle:%22The+Friends+of+Voltaire%22&hl=it&ei=6J3uTbDYKcLX8gOnkLGTBw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCsQ6AEwAA
Another possible source for the quote was proposed by Norbert Guterman, editor of "A Book of French Quotations," who noted a letter to M. le Riche (6 February 1770) in which Voltaire is quoted as saying: "Monsieur l'abbé, I detest what you write, but I would give my life to make it possible for you to continue to write" ("Monsieur l'abbé, je déteste ce que vous écrivez, mais je donnerai ma vie pour que vous puissiez continuer à écrire"). This remark, however, does not appear in the letter.
Misattributed

To William Randolph Hearst. Quoted in "Ask Me Anything: Our Adventures with Khrushchev" - Page 152 - by William Randolph Hearst - 1960