This essay uses a puzzle about assertion and time to explore the pragmatics, semantics, and epistemology of future discourse. The puzzle concerns cases in which a subject is in a position to say, at an initial time t, that it will be that ϕ, but is not in a position to say, at a later time t, that it is or was that ϕ, despite not losing or gaining any relevant evidence between t and t. We consider a number of approaches to the puzzle and defend the view that subjects in these cases lose knowledge simply by moving through time.

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