Bhagavad Gita, Chapter 18, Verse 59

If filled with self-conceit you think, I will not fight, vain is this your resolve; your Prakriti will constrain you.

Real refusal is named here as ultimately powerless against something even more real, one's own actual nature.

Krishna doesn't argue with Arjun's stated intention directly, he points out that nature itself will override it regardless. Real resistance, in this case, is shown as futile against a deeper real pull.