What is non-action? What is it to not to act as the ego-self?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Questioner (Q): There is a passage from the preface of Open Secret — “Abandonment of a phenomenal center constitutes the only ‘practice’, and such abandonment is not an act volitionally performed by the identified subject, but a non-action leaving the noumenal center in…