Necessary
Substance
A necessary substance is a substance that exists no matter what. A necessary substance is a substance that would
exist no matter what possibly true propositions were true. Or to put it another
way, a necessary substance is a substance whose existence is entailed by every
proposition (considering that impossible
propositions are ones that entail everything). A much neglected topic in
metaphysics is an investigation into the existence and nature of necessary
substances. One reason to be optimistic about the existence of necessary
substances is that they would provide a natural explanation as to why there are
any substances in the first place. For more subtle reasons to be optimistic,
see Necessary Concreta.