Reid endorses the idea that what is in our power is just what is up to us. He claims that the only entities that can have power are entities with minds. That is, sticks and stones are never invested with power, and are not, therefore, ever the efficient causes of any events. The earthquake might be the physical cause of the fall of the city, but it is not the efficient cause, Reid thinks, because it does not have a mind. Since it is not up to the earthquake whether or not the city falls, the ear