Bhagavad Gita, Chapter 3, Verse 18

He has nothing to gain in this world by acting, nor anything to lose by not acting, and he has no need to depend on any being for anything.

Doing the work or stepping away from it, neither one changes anything for a person who's already found what they were looking for.

Most people act because they need something, recognition, results, security. Someone who's already complete has nothing left to gain from action or to lose by skipping it, and doesn't need anyone else to supply what they're missing, because nothing is missing anymore.