Why is the doctrine of conversion important for Christians?

Understanding conversion is crucial for Christians as it encompasses the profound change that occurs within a believer when they turn from sin to God. It represents not just a decision but an entire transformation of the will and affections, rooted in the work of the Holy Spirit. The biblical principle that one must be converted to enter the kingdom of heaven is foundational for the faith, as evident in Matthew 18:3. It reminds believers that their salvation is not based on external actions but on a heart changed by grace, leading to a life lived under God's dominion.