looking for help -- humanist source for Alan Moore quote?

Hi all. Is there a source among any of the well-known humanist writers of the 20th century for the following quote from the graphic novel V for Vendetta, written by Alan Moore?

“But it was my integrity that was important. Is that so selfish? It sells for so little, but it’s all we have left in this place. It is the very last inch of us. But within that inch we are free.”

That is, is the meat of this an obvious paraphrase or lifting from some humanist source?

Thank you!

LorenzoBryce said: "is the meat of this an obvious paraphrase or lifting from some humanist source?"
IMO, this was the author's use of an important term in civilized societies. He used it of course in context of the definition of "integrity"

Integrity

Integrity is the practice of being honest and showing a consistent and uncompromising adherence to strong moral and ethical principles and values.[1][2][3] In ethics, integrity is regarded as the honesty and truthfulness or accuracy of one's actions. Integrity can stand in opposition to hypocrisy,[4] in that judging with the standards of integrity involves regarding internal consistency as a virtue, and suggests that parties holding within themselves apparently conflicting values should account for the discrepancy or alter their beliefs.

The word integrity evolved from the Latin adjective integer, meaning whole or complete.[1] In this context, integrity is the inner sense of “wholeness” deriving from qualities such as honesty and consistency of character. As such, one may judge that others “have integrity” to the extent that they act according to the values, beliefs and principles they claim to hold.


https://en.wikipedia.org/wiki/Integrity