How do we know scripture interprets itself?

The principle that scripture interprets scripture is firmly rooted in Reformed theology, especially as articulated in 2 Peter 1:20-21, which clearly states that 'no prophecy of scripture is of any private interpretation.' This means that individual opinions or interpretations are not authoritative; rather, the Bible as a whole clarifies and explains itself. When facing unclear passages, we turn to other biblical texts that elaborate or provide context, ensuring a coherent and consistent understanding of doctrine. Such a hermeneutic is crucial for maintaining the integrity of scriptural teaching and doctrine, avoiding the pitfalls of personal interpretation that could lead to error or misrepresentation of God's word.