Kathryn Perez said this quote

No, that's where you are wrong. Your mind was full of sadness and darkness. That is a very different thing entirely. On earth it's nearly impossible to know it, but our minds are not at all who we are. Our brains are just an organ. When we died, our minds died too. All of this, all of what is to come, it's your soul. Our souls never die. They are the very root of who we are, not what we are, but who we are.