 The intuitive motivation for this principle seems to be that we cannot explain the property Y possessed by an entity e by appealing to a property X possessed by a completely distinct entity. For instance, in order to explain Devadatta’s obesity, we shouldn’t appeal to the gluttony of some person other than Devadatta, but rather to Devadatta’s own overconsumption of food. But Udayana is essentially trying to explain the occasionality of a putative effect by appealing to the property of causal relevance that something else possesses. This violates the principle of explanation.