“By depriving Islam of the means to destroy freedom, we are not violating freedom; we are preserving it.”

Why Socialism Is Bad (2018)

Source: Freedom, Loyalty, Dissent (1954), p. 6
Context: If the preservation of our freedom depends upon the courts then we are, indeed, lost, for in the long run neither courts nor Constitution can save us from our own errors, follies, or wickedness.

First attributed to Lincoln in 2002, this seems a paraphrase of a statement in the Lyceum address of 1838, while incorporating language used by Thomas E. Dewey (c. 1944), who said "By the same token labor unions can never be destroyed from the outside. They can only fail if they fail to lend their united support to full production in a free society".
Misattributed

Letter to William Green Mumford (18 June 1799) http://www.princeton.edu/~tjpapers/munford/munford.html <br class="br">1790s <br class="br">Context: To preserve the freedom of the human mind then and freedom of the press, every spirit should be ready to devote itself to martyrdom; for as long as we may think as we will, and speak as we think, the condition of man will proceed in improvement. The generation which is going off the stage has deserved well of mankind for the struggles it has made, and for having arrested the course of despotism which had overwhelmed the world for thousands and thousands of years. If there seems to be danger that the ground they have gained will be lost again, that danger comes from the generation your contemporary. But that the enthusiasm which characterizes youth should lift its parricide hands against freedom and science would be such a monstrous phenomenon as I cannot place among possible things in this age and country.

1960s

As quoted in The White House Years: Mandate for Change: 1953–1956: A Personal Account (1963), p. 331
1960s

2000s, Burning embassies is not the way (2008)

1970s, Second Inaugural Address (1973)