The proud trusts in himself; the just lives by his faith. It is the proud who are self-sufficient and who fail to realize the necessity of patient endurance and trust in God. In contrast to the proud, the just will be truly preserved through his faithfulness to God. Faith is not a one-time act, but a way of life. The true believer, declared righteous by God, will persevere in faith as the pattern of his life (Hebrews 3:12-14).
Commentary from the MacArthur study bible, notes for Habakkuk 2:4 and Hebrews 10:37, 38.
“Your words against Me are harsh,” says the Lord.
Yet you ask: “What have we spoken against You?”
You have said: “It is useless to serve God. What have we gained by keeping His requirements and walking mournfully before the Lord of Hosts? So now we consider the arrogant to be fortunate. Not only do those who commit wickedness prosper, they even test God and escape.” Malachi 3:13-15
“For indeed, the day is coming, burning like a furnace, when all the arrogant and everyone who commits wickedness will become stubble. The coming day will consume them,” says the Lord of Hosts, “not leaving them root or branches. But you who fear My name, the sun of righteousness will rise with healing in its wings, and you will go out and playfully jump like calves from the stall. You will trample the wicked, for they will be ashes under the soles of your feet on the day I am preparing,” says the Lord of Hosts.