Basically, that we are a collection of inner-selves, not a single self. IFS provides a framework for working with our inner selves.
https://philosophynow.org/issues/97/The_Illusion_of_the_Self
There are multiple selves, and each one of them is not as set in stone as we think.
Is there a non-reddit reference to this "Internal Family Systems" thing? I'd be interested in looking into it more.
Basically, that we are a collection of inner-selves, not a single self. IFS provides a framework for working with our inner selves.