 Leibniz also thinks that the PSR rules out the possibility that there could be two or more indistinguishable, that is, indiscernible, things (A VI, iv, 1541/AG 42). If there were two such things, God would have treated them differently insofar as he has related them differently to the rest of the world. For example, if there were two blades of grass that were indiscernible from each other, then one blade would stand in spatial and temporal relation \(R\) to the rest of the world, whereas the other blade would stand in some other spatial and temporal relation \(R'\) to the rest of the world. Why did God choose to put the first blade relation \(R\) to the rest of the world instead of \(R'\)? Leibniz claims that since they are indiscernible from each other, there could be no reason for God to treat them differently. Thus if there were two indiscernible individuals, then God would have acted for no reason. But there is a reason for everything. So, there are no indiscernible yet numerically distinct things.