Where the righteousness of God demanded the death of the sinner, the Righteous One of God died in the place of sinners. Faith is the admission that God has done all of the work of salvation on your behalf and that you can do nothing to save yourself. Faith is saying that God is God and that His grace is sufficient for you. Faith is coming to the Lord with empty hands and a broken heart and looking to Him to be that which fills and heals. Look again at verse 4.
Pride is the opposite of faith.
The just do not live because of the goodness of their works. They do not live because of their arrogant pride in thinking that they are worthy of God s acceptance. The just shall live by faith. The just shall live by confessing their inadequacy before a holy God and trusting in His Son for our salvation. The third chapter of Habakkuk is a song of praise about the wonders of a God who is so great that He moves in history, not only to balance the books in history, but to balance them on our behalf as He saves us from our sin and sets our feet upon firm ground.