I’ve been thinking a lot lately about eternal things. It is trivially obvious that something must always have existed, for if there had ever been a point at which absolutely nothing existed, then the fact of our own existence is entirely inexplicable. As it has been said, “out of nothing, nothing comes”.
It also strikes me that whatever has always existed is likely to continue to exist eternally. Philosophically, this is known as necessity; It is impossible for a necessary object not to exist. It must exist in any possible world. The opposite of necessity is contingency, which describes something that might or might not exist. Similarly, the opposite of eternality is temporality… things bound to time.
Necessary objects must also possess necessary essential attributes. These attributes are those that make the object what it is, and cause it to be necessary. These attributes are immutable, that is, they cannot change.(1)