Can we walk without fear while in the midst of the fire?

Thousands of people anxiously watched as Shadrach, Meshach, and Abed-nego, hands tied securely behind their backs, were led down a long wooden-planked ramp into a large earthen oven. Flames shot out of the oven, so intense, the soldiers standing near the opening were overtaken by the immense heat and collapsed.

I watched the three young men joyfully walk toward the fiery furnace. A bounce in their steps, they praised God as they went. Without hesitation, the brave young zealots sprang into the blazing inferno, seemingly elated to suffer for their Master. Instantly, Jesus appeared alongside them in the towering hellhole.
"Adventures with Abba"

Isaiah 43:1-3
Fear not, for I have redeemed you, I have called you by name; you are Mine. When you walk through the fire, you shall not be burned, nor shall the flame scorch you, for I am the Lord your God, the Holy One of Israel, your Savior.