How do we know the transforming power of the gospel is real?

The gospel is described as bringing light and truth into the darkness of sin, leading to genuine conversion and transformation in individuals’ lives, as seen in 2 Corinthians 5:17, where it states that 'if anyone is in Christ, he is a new creation.' The testimony of believers’ lives, which reflect a departure from sin and an embrace of holiness, supports the reality of the gospel's transforming power. When the message of Christ is effectually applied by the Holy Spirit, it creates a new identity and purpose, equipping believers to live lives that honor God often in stark contrast to the world.