Consumation? (that's my big word for the day...)

“When you pass through the waters I will be with you; and through the rivers, they shall not overwhelm you; when you walk through the fire you shall not be burned, and the flame shall not consume you. Fear not, for I am with you…” (Isaiah 43: 2, 5a)

What have we to fear if God is with us at all times? If God is on our side, who can be against us? It is so easy to become preoccupied with so many different things that “endanger” us. And it is so easy to forget that in reality, nothing can ever fully separate us from God, our Creator. God created the fire and the rivers. Why would he ever allow them to consume us? It may seem as if we are consumed by them, but in reality our soul is completely free from their strength. Our soul is forever linked to God. It exists and we exist inasmuch as God allows. What can ever harm us completely? If we die in God’s name, we go to heaven. Would you be leaving family and friends behind? Pray them to heaven to come to be with you when their time comes.
Why the preoccupation with death? Why not instead be preoccupied with life? And why not eternal life?