Natural Self is the Soul and illusion is the relative self [prakruti].
Once you understand the innate nature (relative self, prakruti) of the other person, you can remain in an attachment-free state with that person. It is Knowledge (Gnan) to understand the innate nature...
The way in which the twists were entangled to knot up the mind-speech-body and the innate nature (relative self, prakruti), is the manner in which they will be untwisted.