“Macbeth:
If we should fail?
Lady Macbeth:
We fail?
But screw your courage to the sticking place,
And we'll not fail.”
Source: Macbeth
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William Shakespeare 699
English playwright and poet 1564–1616Related quotes
Source: speech at the Ceremony for Decorations for Bravery, June 23, 1995.

“If we fail to prepare, we prepare to fail.”
Fail to prepare; prepare to fail.
By failing to prepare, you are preparing to fail.
Attributed to Franklin in Julita Agustin-Israel, Lakas ng Loob, 1996, p. 53 https://books.google.com/books?id=2Z59AAAAMAAJ&q=prepare; there is no evidence that he coined any forms of this quote.
Misattributed

“We may fail, do fail continually, but He never fails.”
(A.J. Broomhall. Hudson Taylor and China’s Open Century, Book Five: Refiner’s Fire. London: Hodder and Stoughton and Overseas Missionary Fellowship, 1985, 175).

Attributed to R.D. Lang in: Jack Lee Seymour, Margaret Ann Crain, Joseph V. Crockett (1993) Educating Christians. p. 53

"All the Fools Sailed Away" on Dream Evil (1987)
Lyrics

“We will not tire, we will not falter and we will not fail.”
2000s, 2001, Freedom and Fear Are at War (September 2001)
Variant: We will not waver, we will not tire, we will not falter, and we will not fail.
Context: Our nation, this generation, will lift the dark threat of violence from our people and our future. We will rally the world to this cause by our efforts, by our courage. We will not tire, we will not falter and we will not fail.