Bhagavad Gita 2.65

प्रसादे सर्वदुःखानां हानिरस्योपजायते।प्रसन्नचेतसो ह्याशु बुद्धिः पर्यवतिष्ठते ॥२.६५॥

prasāde sarvaduḥkhānāṃ hānirasyopajāyateprasannacetaso hyāśu buddhiḥ paryavatiṣṭhate

In that peace, all pains are destroyed; for the intellect of the tranquil-minded soon becomes steady.

गीता