But my righteous one (the one justified by faith) shall live by faith (respecting man’s relationship to God and trusting Him); and if he draws back (shrinking in fear), my soul has no delight in Him. Hebrews 10:38
What defines a righteous person? A person that believes the promises of God, believes God, not just “in Him”. A righteous person knows, no matter what it looks like right now, God will turn things around. “I can trust Him with the outcome and I know His plan is good for me.” And that’s how we live by faith. We just keep walking with our head up and His joy in us. We can’t shrink back in fear because then our trust has just wavered and He will not have any pleasure in us.