The Walking Bible, page-41

We don't even know whether a valid concept of eternity exists outside mathematics or whether the languages used to write scripture had a word for eternity.
What I do know is that some theists claim that they know of a God who is outside time and space and has a limitless life span and energy without offering feasible explanations while, and this is the point, rejecting theories with mountains of evidence like the Theory of Evolution and the effects of entropy.