Bhagavad Gita 15.20

इति गुह्यतमं शास्त्रमिदमुक्तं मयाऽनघ।एतद्बुद्ध्वा बुद्धिमान्स्यात्कृतकृत्यश्च भारत॥

iti guhyatamaṃ śāstramidamuktaṃ mayā'nagha |etadbuddhvā buddhimānsyātkṛtakṛtyaśca bhārata ||

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.

Thus, O sinless one, I have revealed this most mystic knowledge to thee. He who understands it gains wisdom and attains the consummation of life.

Our plain-language meaning of this verse is waiting for scholar review.