But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. And the law is not of faith: but, The man that doeth them shall live in them. – Gal 3:11-12
Now, the prophet [Habakkuk] had spoken about the chastisements and judgments that God would send on the people; therefore, having examined the situation, we might well have concluded that all was lost. Then he says that the pride of the wicked will swell and increase, but that their feet are in a slippery place and they will stumble in the way. The more they seek to exalt themselves, the more grievous will be their fall. This is what the prophet pronounces upon the wicked. On the other hand, he says of the just that they shall ‘live by faith’. Notice he says that the just shall live, implying that God’s children will not find life here below. Even if they were to travel all over the world, and search high and low, they would soon realise that there is death and decay everywhere and in everything. However, though they do not enjoy this ‘life’ at the present time, they look forward to a life to come, and cherish it in their hearts and minds by faith. The prophet is seeking to draw the minds of God’s elect away from both the world and themselves, so that they may cleave entirely to God, finding his grace alone sufficient for their salvation.
Sermons of John Calvin: A Selection of Thirty Six Various Sermons, “We All Stand Condemned by the Law”