Diachronic Requirements on Practical Commitments

John Broome's main project inRationality through Reasoning (2013) is to defend the idea that, through reasoning, we actively bring ourselves to satisfy the synchronic and diachronic requirements of rationality. In this paper, I will examine three aspects of Persistence of Intention that I find problematic: the relation between practical rationality and forgetting, the role played by "cancelling events", and the claim that consideration leads to satisfaction of the requirement. To tackle these difficulties, I will suggest that rationality requires us to have effective, and not merely persistent, intentions.