When are we not ourselves?

[Spirian]

They say we have every cell in our body replaced every 7 years. Are we the same person then? It's like the ship of Theseus. Replace every component and it's not the same ship.

Since we are not the same person, the old person died and we are simply a copy. Why should we even fear death? We die every day one cell at a time. Every aspect of you today will be dead in a few years and replaced with a copy.

What are your thoughts on this?

I am renewed in my flesh every moment, why should I fail to believe that my mind is not the same? What I believe today is dynamic, not unlike the universe in which I exist. When I become certain, I am certainly doomed, even as I speak, I betray my former self that existed a moment ago.