Bhagavad Gita Chapter 18, Verse 59

यदहङ्कारमाश्रित्य न योत्स्य इति मन्यसे | मिथ्यैष व्यवसायस्ते प्रकृतिस्त्वां नियोक्ष्यति ||

yad ahaṅkāram āśritya na yotsya iti manyase mithyaiṣa vyavasāyas te prakṛtis tvāṁ niyokṣyati

If, taking refuge in ego, you think 'I will not fight', that resolve of yours is false. Your nature will compel you.

Krishna addresses Arjuna's potential hesitation. 'Yad ahaṅkāram āśritya na yotsya iti manyase'—if (yat), taking refuge in ego (ahaṅkāram āśritya), you think (manyase) 'I will not fight' (na yotsya iti). 'Mithyaiṣa vyavasāyas te prakṛtis tvāṁ niyokṣyati'—that resolve (eṣaḥ vyavasāyaḥ) of yours (te) is false (mithyā). Your nature (prakṛtiḥ) will compel you (tvām niyokṣyati). This is the key teaching: if you think you can avoid action by relying on ego, that resolve is false. Your nature will compel you to act. You cannot escape action through ego—nature will force you to act. This emphasizes that you should perform action as your duty, not try to avoid it through ego. The only way to be free is through unattached action, not through ego-based avoidance.