Chapter 4 - Verse 37

यथैधांसि समिद्धोऽग्निर्भस्मसात्कुरुतेऽर्जुन ।
ज्ञानाग्निः सर्वकर्माणि भस्मसात्कुरुते तथा ॥ ३७ ॥

yathaidhāṃsi samiddho’gnirbhasmasātkurute’rjuna .
jñānāgniḥ sarvakarmāṇi bhasmasātkurute tathā .. 37 ..


As kindled fire reduces fuel to ashes, O Arjuna, so does wisdom-fire reduce all actions to ashes.
Read the commentary
Just as a well-kindled fire reduces fuel to ashes, so does the fire of the wisdom reduce all actions to ashes, i.e., it renders them impotent. The fire of wisdom cannot indeed literally reduce actions to ashes as fire reduces fuel to ashes. Accordingly we should understand that right knowledge is the cause which renders all actions impotent. But the actions by which this body has been brought into existence will come to an end only when their effects will have been fully worked out; for, those actions have already commenced their effects. Thus wisdom can destroy only such actions as have not yet begun to produce their effects, whether they are actions done in this birth before the rise of knowledge and along with knowledge, or those done in the many previous births.