What is happening in a moment is happening forever, in parallel, not before or after past-future. When we regret that the moment passed away we are confusing one reality with another instead of receiving them both simultaneously. In fact by this misperception we are killing the moment by placing it, in our imagination, inside a wrong series to which it does not belong. In time, what will die is already dead but that is not preventing it from being immortal. Immortality is not the afterlife, it is a life outside of time.