Chānd-Mül, 1879-849. That is the ether within the heart. That ether in the heart (as Brahman) is omnipresent and unchanging. He who knows this obtains omnipresent and unchangeable happiness.
http://www2.hf.uio.no/common/apps/permlink/permlink.php?app=polyglotta&context=record&uid=cc31a17b-8e41-11ee-937a-005056a97067