What is it to live by faith?

“What is it to live by faith? It is what the three Hebrew men Shadrach, Meshach, and Abed-nego said to Nebuchadnezzar:  ‘Our God… will deliver us out of your hand, O king. But if He does not… we will not serve your gods nor worship the golden image that you have set up’ (Dan. 3:17-18). They were saying even if God did not save them, they still would not change. This is to live by faith.”

(CWWN, vol. 11, Living by Faith)