US-P18.207ab ।US-P18.207cd ॥
In plain words
If you are already the accomplished, nothing is left for you to do. If work is still left for you to do, you are not the accomplished. Take your stand on both at once, and the only person you are cheating is yourself.
Close to the Sanskrit
For indeed, of the accomplished one there is nothing to be done; of the one having a task, there is no accomplishedness. Making a reliance on both, this one deceives himself.