Who by the mouth of thy servant David.... — The older MSS. present many variations of the text. It probably stood originally somewhat in this form: “Who through the Holy Ghost, by the mouth of David our father, thy servant,” and was simplified by later copyists. In the citation from Psalms 2 we have another lesson from the Apostles’ school of prophetic interpretation. The Psalm is not cited in the Gospels. Here what seems to us the most striking verse (Acts 4:7) of it is passed over, and it does not appear as referred to Christ till we find it in Hebrews 1:5; Hebrews 5:5.
Why did the heathen rage, and the people imagine...? — Neither noun has the article in the Greek or in the Hebrew. Why did nations rage and peoples imagine...? The word for “rage” is primarily applied to animal ferocity, especially to that of untamed horses.