Sentence:  Heidegger accompanies this meditation, however, with a second, more overtly "philosophical" or "thinking" reflection on the "<WSD>guideword</WSD>" "Das Wesen der Sprache: -- die Sprache des Wesens" ("The essence of language: -- the language of essence"). 
Meaning of the word marked with <WSD> tags:  A watchword; a word or phrase that serves as one's guide.