The question is ambiguous between - does anything that exists have a cause, and does anything that exists have a reason or a purpose? In Platonism, mechanical causation is not possible without teleological causation and ‘reason’ is a broader category than causation. For example, for Leibniz, an infinite regress of cause and effects is possible, but the entire series must have a reason for existing, and this reason must be outside them. The infamous PSR is not a theory of mechanical causation, but a principle of harmony that says God orders everything according to the best and the existence of something is its compossibility in relation to the whole. This is to say that a monad is compossible or exists not because of its logical possibility but its ability to add to the overall purpose of things. In this worldview, the purpose is the ‘why’ of things, and this teleology is immanent within the thing itself and not externally imposed. To exist is to exist as a thing that acts to fulfil its...
For Those Who Love Philosophy