We only live in present. However, limiting one self to the present reality, living only in present forgetting the past and without thinking about the future, restricts our only once happening life experience to one dimension, present. Meanwhile, those who remember past, live in their memories, live in their dreams and live in present are virtually everywhere on their timeline. They experience their existence fully.
People feel that they are alive when they are facing death.
Sorry I don’t know who said it.