How do we know that circumcision of the heart is essential for Christians?
Answered in 1 source
The necessity of circumcision of the heart is emphasized in Scripture, particularly in Romans 2:29, which states that true circumcision is a matter of the heart.
The New Testament teaches that circumcision is no longer merely a physical act but is instead a matter of the heart, as seen in Romans 2:29. Paul points out that true Jews are those who have experienced this inward change. This aligns with the prophetic words found in Deuteronomy, where God promises to circumcise the hearts of His people, enabling them to love Him wholly (Deuteronomy 30:6). Through faith in Christ, believers are spiritually circumcised, indicating a reliance not on works but on divine grace. Regeneration by the Holy Spirit marks this transformation as essential for all who claim to follow Christ.
Commentary