Bhagavad Gita · Chapter 5: Renunciation in Action

Bhagavad Gita 5.12

yuktaḥ karmaphalaṃ tyaktvā śāntimāpnoti naiṣṭhikīm | ayuktaḥ kāmakāreṇa phale sakto nibadhyate ||

The disciplined person, giving up the fruit of action, attains lasting peace. The undisciplined person, driven by desire and attached to the fruit, is bound.

Modern context

Two people can do the same work and have opposite inner lives. One has let go of the result and finds a peace that lasts. The other is driven by wanting and tied to the outcome, and is bound. The difference lies wholly within. The peace is called 'lasting' because it does not hang on how things turn out. A peace that depends on success is only a pause between worries.