We are not just a brain we are souls. Our souls contain all of who we are; our thoughts and emotion. Our soul is an intricate part or our identity. If our body is damaged somehow, or ages, our soul remains. Even if our brain is damaged our soul remains. Our soul is eternal and is the seed that is contained within our body. Our soul is released when we die. Each of us has a choice about the destiny of our soul. It is a very important choice. The most important that we will make in our whole life. I made this choice when I was 4 or 5years old. I gave my soul to my Lord and Saviour, Jesus Christ, because I love him and I want to live with him when my soul is released from my body.
But God gives it a body as he has determined, and to each kind of seed he gives a body.
Corinthians 15:38