Abstract

We often promise to ϕ despite having evidence that there is a significant chance that we won’t ϕ. This gives rise to a pressing philosophical problem: Are we irresponsible in making such promises since, it seems, we are insincere or irrational in making them? I argue that we needn’t be. When it’s up to us to ϕ, our practical reasons for ϕ-ing partly determine whether it is rational for us to believe that we will ϕ. That is why we can sometimes rationally believe that we will ϕ even if our belief goes against the evidence.