Hume’s third objection is that in a causal series of contingent beings without a temporal beginning, each being will have a causal explanation by virtue of its predecessors. Since there is no first being, there will be a causal explanation for every contingent being on the basis of previously existing contingent beings. However, if each individual contingent being has a causal explanation, then the entire causal series has an explanation. For wholes are nothing over and above their parts: