। ॥
In plain words
For the wise, who know that all of this — every last bit of it — is Brahman: what is there to think about, and what to keep from thinking? What to say, and what to leave unsaid? What to do, and what to leave undone?
Close to the Sanskrit
What is to be thought, what is not to be thought; what is to be spoken, and what indeed is not to be spoken; what is to be done, what is not to be done — for the wise, who know that the whole is Brahman?