Meaning

To hold one's aspirations and principles immovably, never yielding to external temptation or pressure.

自分の意志や主義を堅く守り、外部からの誘惑や困難に絶対に屈しないこと。

The Kyojuro Rengoku line

Verbatim from the source article

「俺は如何なる理由があろうとも鬼にならない」

"I HAVE MANY REASONS FOR NOT BECOMING A DEMON."

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Why it fits Kyojuro Rengoku

Akaza offers Rengoku immortality, infinite strength, the chance to keep fighting forever — and Rengoku refuses in one flat sentence. Shisō-kengo names that specific moral move: the refusal that does not even pause to weigh the offer.

Sources

• デジタル大辞泉 — 志操堅固 (dictionary)

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