Both the undisturbed equanimity and the inhibited discontent of everyday heedfulness, the way we slide over from one to another or slip into bad moods, are by no means nothing ontologically although these phenomena remain unnoticed as what is supposedly the most indifferent and fleeting in Dasein. The fact that moods can be spoiled and change only means that Dasein is always already in a mood. The often persistent, smooth, and pallid lack of mood, which must not be confused with a bad mood, is far from being nothing. Rather, in this Dasein becomes tired of itself. The being of the there has, in such a bad mood, become manifest as a burden [Last].*† One does not know why. And Dasein cannot know why because the possibilities of disclosure belonging to cognition fall far short of the primordial disclosure of moods in which Dasein is brought before its being as the there. Furthermore, an elevated mood can alleviate the manifest burden of being. But the possibility of this mood, too, discloses the burdensome character of Dasein even when it alleviates that burden. Mood makes manifest "how one is and is coming along." In this "how one is" being in a mood brings being to its "there."
In being in a mood, Dasein is always already disclosed in accordance with its mood as that being to which Dasein was delivered over in its being as the being which it, existing, has to be. To be disclosed does not, as such, mean to be known. And even in the most indifferent and harmless everydayness the being of Dasein can burst forth as the naked "that it is and has to be." The pure "that it is" shows itself, the whence and whither remain obscure. The fact that Dasein normally does not "give in" to such everyday moods, that is, does not pursue [135] what they disclose and does not allow itself to confront what has been disclosed, is no evidence against the phenomenal fact of the moodlike disclosure of the being of the there in its that, but is rather evidence for it. For the most part Dasein evades the being that is disclosed in moods in an ontic and existentiell way. Ontologically and existentially this means that, even in that to which such a mood pays no attention, Dasein is unveiled in its being delivered over to the there. In the evasion itself the there is something disclosed.
We shall call this character of being of Dasein which is veiled in its whence and whither, but in itself all the more openly disclosed, this "that it is," the thrownness [Geworfenheit] of this being into its there; it is thrown in such a way that it is the there as being-in-the-world. The expression thrownness is meant to suggest the facticity of its being
* 'Burden': what bears [das Zu-tragende]; human being is delivered to Da-sein, appropriated by it. To bear [Tragen]: to take over something from out of belonging to being itself.
† In earlier editions this sentence read: "Being has become manifest as a burden." [TR].