There are two ways to live: one is to live by human reason, the other is to live by faith. And God is saying to Habakkuk, this is how the just, the upright, the one whom God has justified live, or in the New Testament language—this is how Christians live—by faith! Trusting him, even when you do not have all the answers. Even when you cannot see the way ahead, you trust him. Even when you wish with all your heart that life was different than it is right now, hang tight! Stay calm!1
Derek W. H. Thomas
4 “Behold, his soul is puffed up; it is not upright within him, but the righteous shall live by his faith.