Chapter 15 · verse 20 · gita.yoga.org

Bhagavad Gita 15.20

इति गुह्यतमं शास्त्रमिदमुक्तं मयाऽनघ।एतद्बुद्ध्वा बुद्धिमान्स्यात्कृतकृत्यश्च भारत

Thus, I have imparted to you this most secret science, O sinless one; by knowing this, one becomes wise, and all their duties are accomplished, O Arjuna.