Bhagavad Gita, Chapter 4, Verse 37

As blazing fire reduces wood into ashes, so, O Arjuna, does the fire of knowledge reduce all Karma to ashes.

Real insight doesn't just soften old weight, it can burn through a huge amount of it, fast.

The comparison is deliberately dramatic: fire doesn't slowly wear wood down, it consumes it completely. Genuine understanding is described with that same intensity, capable of clearing out accumulated weight far quicker than simply waiting it out.