Full Idea
For Heidegger moods are disclosive; they show us things in a more fundamental way than theoretical propositions ever can. For example, fear reveals something as a threat.
Gist of Idea
Moods are more fundamentally revealing than theories - as when fear reveals a threat
Source
report of Martin Heidegger (Being and Time [1927], I.5.30) by Richard Polt - Heidegger: an introduction 3.§30
Book Reference
Polt,Richard: 'Heidegger: an introduction' [Routledge 2003], p.66
A Reaction
Most modern students of emotion seem to agree. Even though they may not have specific content, it is always possible to consider the underlying cause of the mood.