Chapter 13 · The Field and the Knower · Krishna said
Bhagavad Gita 13.10 — Even mind in all events
असक्तिरनभिष्वङ्गः पुत्रदारगृहादिषु। नित्यं च समचित्तत्वमिष्टानिष्टोपपत्तिषु ॥
asaktiranabhiṣvaṅgaḥ putradāragṛhādiṣu | nityaṃ ca samacittatvamiṣṭāniṣṭopapattiṣu ||
Meaning
non-attachment, not clinging to children, spouse, home and the like, and a mind that stays even in both wanted and unwanted events —