Bhagavad Gita Chapter 17 Verse 16

Gita 17.16

मनः प्रसादः, सौम्यत्वम्, मौनम्, आत्मविनिग्रहः,
भावसंशुद्धिः, इति, एतत्, तपः, मानसम्, उच्यते।।16।।

Gita 17.16

ManH, prsaadH, saumyatvam’, maunm’, aatmvinigrhH,
BhaavsanshuddhiH, iti, etat’, tapH, maansam’, uchyate ||16||

Translation: (ManH prsaadH) happiness of mind (saumyatvam’) calmness (maunm’) apart from discussion about God, silence in worldly talks (aatmvinigrhH) restraint of every thought and (bhaavsanshuddhiH) purity in feelings (iti) thus (etat’) this (maansam’) related to mind (tapH) austerity (uchyate) is said to be. (16)

Translation: Happiness of mind, calmness, apart from discussion about God, silence in worldly talks, restraint of every thought and purity in feelings; thus, this is said to be austerity related to mind.