Bhagavad Gita, Chapter 2, Verse 65

प्रसादे सर्वदुःखानां हानिरस्योपजायते । प्रसन्नचेतसो ह्याशु बुद्धिः पर्यवतिष्ठते

prasāde sarvaduḥkhānāṃ hānirasyopajāyate | prasannacetaso hyāśu buddhiḥ paryavatiṣṭhate

Translation

In peace there is an end of all his miseries; for, the reason of the tranquil-minded soon becomes steady.

— Alladi Mahadeva Sastri

Word meanings

prasāde
in (the state of) peace
sarvaduḥkhānām
(of) all, of pains
hāniḥ
destruction
asya
of him
upajāyate
arises
prasannacetasaḥ
peaceful, mind, whose, his
hi
indeed
āśu
quickly
buddhiḥ
the Reason
paryavatiṣṭhate
settles down

Śaṅkarācārya's commentary

In that tranquillity (prasāda), all his miseries come to an end; for the buddhi of the tranquil-minded (prasanna-cetas) very quickly becomes firmly established (paryavatiṣṭhate) in the Self. Inner peace is the doorway to steady knowledge.