Don’t die. That’s the simple mission statement of Bryan Johnson, tech entrepreneur, who is on a mission to extend his life as long as possible. He is not alone in this quest. In fact, the preoccupation with longevity is everywhere. Entrepreneurs are using AI to crack the longevity code. Cities are vying to be the new “longevity hubs.”

Most of the longevity movement is not really about immortality but rather about extending life and limiting the damaging effects of aging. Of course, we all want longevity. The danger of Johnson’s obsessive approach is spending so much time trying to extend your life that you never quite get around to living it.

Indeed, keeping death close—even while pushing it as far into the future as we can—has many lessons to teach us about life…. Death can help us focus our attention on living our best life, because there’s nothing that can teach us more about how to live life than death. Death is the most universal experience, yet we will do anything and everything we can to curtain it off, to avoid dealing with the only plot twist that we know for sure will be in our story’s last act.

Here lies the crux of the error of those that see human beings solely as material beings, they have confused an immortal soul with an immortal body. As the philosopher Pierre Teilhard de Chardin put it, “We are not human beings having a spiritual experience. We are spiritual beings having a human experience.”

When we don’t allow death into our lives, we lose the clarity, perspective, and wisdom that only death can bring. That’s why psychiatrist Elisabeth Kübler-Ross called death the key to the door of life: “It is the denial of death that is partially responsible for people living empty, purposeless lives; for when you live as if you’ll live forever, it becomes too easy to postpone the things you know that you must do.”