Bhagavad Gita 18.60
O Arjuna! Your duty binds you. It has arisen from your own nature, and that which you do not desire to do in your delusion, you will do that very thing. You are helpless.
स्वभावजेन कौन्तेय निबद्धः स्वेन कर्मणा।कर्तुं नेच्छसि यन्मोहात्करिष्यस्यवशोऽपि तत्॥svabhāvajena kaunteya nibaddhaḥ svena karmaṇā|kartuṃ necchasi yanmohātkariṣyasyavaśo'pi tat||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).