In plain words
For one who has come to rest in the state of the supreme Self, there is no mark in this world and no rule of conduct for a stage of life. He gains nothing by what he has done, and nothing remains for him to do. There is no rule that says to him ‘do’. Discern this.
Word for word
Discern that for one established in the supreme Self there is no identifying mark or binding observance of a stage of life in this world, no gain from what has been done, nothing remaining to do, and no injunction saying ‘do’.