Bhagavad Gita 4.39 Chapter 4, Verse 39

श्रद्धावाँल्लभते ज्ञानं तत्परः संयतेन्द्रियः ।
ज्ञानं लब्ध्वा परां शान्तिमचिरेणाधिगच्छति ॥४.३९॥

śraddhāvā~llabhate jñānaṃ tatparaḥ saṃyatendriyaḥ
jñānaṃ labdhvā parāṃ śāntimacireṇādhigacchati

Meaning

One with faith, devoted to it and with the senses controlled, gains knowledge; and having gained knowledge, quickly attains supreme peace.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 4.39 (Chapter 4, The Yoga of Knowledge and Renunciation of Action, Verse 39)