Bhagavad Gita · Chapter 2: The Path of Understanding
Bhagavad Gita 2.65
प्रसादे सर्वदुःखानां हानिरस्योपजायते ।
प्रसन्नचेतसो ह्याशु बुद्धिः पर्यवतिष्ठते ॥
prasāde sarvaduḥkhānāṃ hānirasyopajāyate | prasannacetaso hyāśu buddhiḥ paryavatiṣṭhate ||
In that serenity all sorrows come to an end, for the understanding of one whose mind is serene soon becomes steady.
Modern context
A serene mind sees clearly, and a clear mind soon becomes steady. We often try to think our way out of distress, when the thinking is itself disturbed. Krishna puts the order the other way: first calm, then clarity. Settle the mind and good judgement follows of itself.