In this life, there is a line between fighting and letting go. I think both are important to living and both are important to dying. It is important to fight for the return of health and not yield to despair, but it is equally important to relinquish our life to sovereign God.
In his book, Anti-Cancer, David Servan-Schreiber, MD, Phd devotes a whole chapter to the anti-cancer mind. There is much research to support the notion that giving into despair hastens death. Despair, however, is something very different than letting go. “Despair” means to be without hope. “Letting go” means to not cling to something that is not wholly ours.
Whereas there is no hope in despair, there is much hope in letting go. As a Christian, my hope is eternity with God. I have the hope of Heaven. Now this is eternal life; that they may know you, the only true God, and Jesus Christ, whom you have sent. John 17:3
Furthermore, my life is not mine to cling to and in fact, when I do, I demonstrate idolatry.
I trust the Lord. I am sealed by the Holy Spirit for eternity. I absolutely trust His Word that Heaven is my eternal home and that it will be beyond anything I can imagine now.
So I choose to fight for my life, which I consider valuable and which I know God considers valuable, but I also want to continually remember that God is sovereign and that I am here by His appointment, in His care, under His training, for His time.
I point the reader to a relevant passage in one of my favorite books, Beyond Ourselves, by Catherine Marshall. Chapter 6, The Prayer of Relinquishment.