BG-SS 2.39

eṣā te ’bhihitā sāṅkhye buddhir yoge tv imāṁ śṛnu buddhyā yukto yayā pārtha karma-bandhaṁ prahāsyasi [39]

(he) pārtha–O son of Kuntī; abhihitā te–I have revealed to you; eṣā buddhiḥ sāṅkhye–this knowledge of the soul. tu–Further; śṛṇu–hear of; imām–this knowledge; yoge–in (bhakti-) yoga, in practice; yayā buddhyā yuktaḥ–attaining which wisdom; prahāsyasi–you will be completely freed; karma-bandham–from the bondage of action. [39]

Text

I have revealed to you this knowledge (buddhi) of the soul. Now hear from Me how to act in this knowledge (bhakti-yoga), through which you will be able to free yourself from the bondage of action.

Purport

“It will be revealed that buddhi-yoga (yoga of wisdom) is a singular path. When buddhi-yoga is seen to be limited by the ideal of action, it is known as karma-yoga; when it extends beyond action up to the peak of knowledge, it is known as jñāna-yoga or sāṅkhya-yoga; and when, transcending the limitations of both action and knowledge it touches bhakti or devotion, it is then known as bhakti-yoga, or perfectly pure and complete buddhi-yoga.”

—Śrīla Bhakti Vinod Ṭhākur

Srimad Bhagavad Gita.

Chapter 2: The Constitution of the Soul (Sāṅkhya-yoga). Text 39

I have revealed to you this knowledge (buddhi) of the soul. Now hear from Me how to act in this knowledge (bhakti-yoga), through which you will be able to free yourself from the bondage of action.