Hebrews 10:26 (NIV)
If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left,
Sin we we take us far away from because we won't have the boldness to go to the father. We are to trust God for everything even the forgiveness of our sins.
When we fall sick even as a result of anything, we must trust God to heal us and if He allows it to lead to death, we can be assured that in Him we would resurrect.
Hebrews 10:38 (NIV)
And, “But my righteous one will live by faith. And I take no pleasure in the one who shrinks back.”
God takes no pleasure in those who put their hands on the plough and looked back. He wants us to hold on to the confession of our faith.