Why is inward revelation essential in Christianity?

Inward revelation is essential to genuine Christianity as it signifies the work of the Holy Spirit in the hearts of believers, as marked by the statement in Galatians 1:16 where Paul mentions God's will to reveal His Son 'in me.' This inner change is critical because it transcends mere intellectual assent to the truths of Scripture and leads to a personal encounter with Christ. Inward revelation is the means by which the Gospel's truth becomes alive in the believer's heart, producing genuine faith, repentance, and a transformed life. It is through this inward call that one can truly understand their sinful condition and God's redemptive plan, which ultimately leads to personal salvation.