Bhagwad Gita
Chapter 15, Verse 20
इति गुह्यतमं शास्त्रमिदमुक्तं मयाऽनघ।एतद्बुद्ध्वा बुद्धिमान्स्यात्कृतकृत्यश्च भारत।।15.20।।
This is the most confidential part of the Vedic scriptures, O sinless one, and it is disclosed now by Me. Whoever understands this will become wise, and his endeavors will know perfection.