I Don't Have a Sister, but I've Never Had a Sister, So It's Not Necessary

If one plus one equals two, then it has to always be true. But aristotle thinks something even stronger than this, right? Because not only does he think that the cosmos as a whole and the species are eternal, but he also thinks that anything that is eternally present or eternally the case, is necessary. For example, i don't have a sister. I've never had a sister. It doesn't look like i'm ever going to having a sister. So it's eternally thecase that i don'thave a sister. But you would have thought it was possible that i could have had a sister,. It just didn't work out that way.