Inasmuch as we are an expression of an eternal truth that aspect of us lacks beginning and end. So if we add one and one and make two, we are, by our action expressing or instant using an eternal truth, namely, that 1+1=2.
And yet that kind of immortality is in no way emotionally satisfying. Why? Because our instantiation of the eternal truth does not help the eternal truth that we manifest. It does not matter to “1+1=2” that we instantiate it.
We want immortality that makes our mortal lives, our successes,failures and strivings, matter.