Chapter 5 · The Yoga of Renunciation · Krishna said
Bhagavad Gita 5.12 — Peace by letting go of results
युक्तः कर्मफलं त्यक्त्वा शान्तिमाप्नोति नैष्ठिकीम्। अयुक्तः कामकारेण फले सक्तो निबध्यते ॥
yuktaḥ karmaphalaṃ tyaktvā śāntimāpnoti naiṣṭhikīm | ayuktaḥ kāmakāreṇa phale sakto nibadhyate ||
Meaning
The one steady in yoga, who gives up the fruit of action, gains lasting peace. The one driven by desire and attached to results stays bound.