Bhagavad-gītā 4.39
BG 4.39
Open the full passageश्रद्धावाँल्लभते ज्ञानं तत्परः संयतेन्द्रियः । ज्ञानं लब्ध्वा परां शान्तिमचिरेणाधिगच्छति ॥३९॥
Sanskrit
śraddhāvāl labhate jñānaṁ tat-paraḥ saṁyatendriyaḥ jñānaṁ labdhvā parāṁ śāntim acireṇādhigacchati
Translation
A faithful man who is dedicated to transcendental knowledge and who subdues his senses is eligible to achieve such knowledge, and having achieved it he quickly attains the supreme spiritual peace.