New Defender's Study Bible Notes
1:20 first. This should read, “first of all” or “as of primary importance.”
1:20 prophecy. “Prophecy” refers not just to predictions of the future, but to any divinely inspired utterance—therefore to all the Holy Scriptures.
1:21 spake. Note also Hebrews 1:1.
1:21 moved. Compare Genesis 1:2. “The Spirit of God moved” in the presence of the primeval waters of the newly created cosmos, and it became vibrant with pulsating energy and activity. In somewhat analogous fashion, the Spirit of God moved the hearts, minds and pens of the holy (that is, called and set apart) men of God, and the Scriptures were formed, proceeding from the eternal mind of God to be revealed to His creatures.