What the Bible says about Stoutness of Heart
(From Forerunner Commentary)
Here, Isaiah uses a figure of speech to make pride and its fruit synonymous. Pride is not literally arrogance but an elevated opinion of oneself. When one is proud, however, arrogance is also present. Therefore, the Bible pulls no punches, telling us that arrogance and pride are synonymous. Where pride is, arrogance will also be found in some degree. Does arrogance promote oneness?
John W. Ritenbaugh
Pride, Humility, and the Day of Atonement