संसारे निवसन् स्वायसज्ज: कज्जलवेश्मनि ।
लिप्यते निखिलो लोक: ज्ञानसिद्धो न लिप्यते ॥१॥८१॥
Living in the kajjal-griha (house of soot) of samsara, the self-absorbed world gets karmically stained. But the jnana-siddha does not get stained.
The jnana-siddha passes through the same soot-house as everyone else — same streets, same family, same daily encounters with the world's soot. But the jnana-rasayan forms a layer of recognition: "I am not this house. I am not this soot. I am the atma — radically other than all of this." This recognition is not detachment in the sense of indifference — it is precise discrimination. The kajjal cannot stick to what knows itself to be other than kajjal. The teaching is simultaneously a diagnosis (this is why all worldly souls are stained) and a prescription (jnana-siddhi is the answer).
The simple version: You cannot leave the soot-house. But you can apply the protective layer before entering. That layer is jnana. Without it, everyone who enters gets covered. With it, even the one who walks through the soot comes out clean.