Who shall declare his way to his face? - That is, the face of the wicked. Who shall dare to rise up and openly charge him with his guilt? The idea is, that none would dare to do it, and that, therefore, the wicked man was not punished according to his character here, and was reserved to a day of future wrath.

And who shall repay him what he hath done? - The meaning is, that many wicked people lived without being punished for their sins. No one was able to recompense them for the evil which they had done, and consequently they lived in security and prosperity. Such were the tyrants and conquerors, who had made the world desolate.

Job 21:31 Parallel Commentaries

Whether a Man Can Hate the Truth?
Objection 1: It would seem that a man cannot hate the truth. For good, true, and being are convertible. But a man cannot hate good. Neither, therefore, can he hate the truth. Objection 2: Further, "All men have a natural desire for knowledge," as stated in the beginning of the Metaphysics i, 1. But knowledge is only of truth. Therefore truth is naturally desired and loved. But that which is in a thing naturally, is always in it. Therefore no man can hate the truth. Objection 3: Further, the Philosopher …
Saint Thomas Aquinas—Summa Theologica

The Careless Sinner Awakened.
1, 2. It is too supposable a case that this Treatise may come into such hands.--3, 4. Since many, not grossly vicious, fail under that character.--5, 6. A more particular illustration of this case, with an appeal to the reader, whether it be not his own.--7 to 9. Expostulation with such.--10 to 12. More particularly--From acknowledged principles relating to the Nature of Got, his universal presence, agency, and perfection.--13. From a view of personal obligations to him.--14. From the danger Of this …
Philip Doddridge—The Rise and Progress of Religion in the Soul

The Resemblance Between the Old Testament and the New.
1. Introduction, showing the necessity of proving the similarity of both dispensations in opposition to Servetus and the Anabaptists. 2. This similarity in general. Both covenants truly one, though differently administered. Three things in which they entirely agree. 3. First general similarity, or agreement--viz. that the Old Testament, equally with the New, extended its promises beyond the present life, and held out a sure hope of immortality. Reason for this resemblance. Objection answered. 4. …
John Calvin—The Institutes of the Christian Religion