New Defender's Study Bible Notes
3:3 shall their unbelief. The fact that many people reject the Scriptures, even alleging that the Bible has been disproved by modern science and reason, means nothing whatever except that it displays their own self-inflicted deception. God’s Word has been forever settled in heaven and will endure forever (Psalm 119:89,160), even after this present earth has passed away (Matthew 24:35). God’s revealed Word is absolute truth, and will judge all its detractors in the last day (see on Revelation 20:12; 22:18-19).
3:4 it is written. This phrase is quoted and applied from Psalm 51:4.