Full Idea
Novalis came to think that the kind of existence , or 'being', that is disclosed in self-consciousness remains, as it were, forever out of our reach because of the kind of temporal creatures we are.
Gist of Idea
Novalis thought self-consciousness cannot disclose 'being', because we are temporal creatures
Source
report of Novalis (Logological Fragments I [1798]) by Terry Pinkard - German Philosophy 1760-1860 06
Book Reference
Pinkard,Terry: 'German Philosophy 1760-1860' [CUP 2002], p.145
A Reaction
It looks here as if Novalis kicked Heidegger's Dasein into the long grass before it even got started, but maybe they have different notions of 'being', with Novalis seeking timeless being, and Heidegger, influenced by Bergson, accepting temporality.