How do we know if someone really believes in the Gospel?

Determining the authenticity of someone's belief in the Gospel goes beyond mere verbal affirmation; it requires examining the fruit of their life. In Galatians 5:22-23, the Apostle Paul outlines the fruits of the Spirit—love, joy, peace, and more—as evidences of genuine belief. Individuals who confess Christ yet demonstrate pride, strife, and a lack of love may not truly possess saving faith. The reality is that many can articulate Gospel truths but lack the heart knowledge requisite for true belief. Therefore, it is essential for believers to introspectively assess whether they demonstrate the transformative power of the Gospel in their lives, rather than simply possessing a head knowledge of it.