 In  Section 1,  we introduced the distinction between a tensed proposition and a tenseless proposition. Tensed propositions can fully and accurately describe the world, but nevertheless change truth value over time. Tenseless propositions, on the other hand, are always true or always false—they reference a particular time in the proposition and never change. Propositions represent ways reality could be. So, which view of propositions we adopt depends on what we think it means for reality itself to undergo change.