How do we know that Christ's Word has power?

Christ’s Word is shown to have authority and power through numerous miracles recorded in the New Testament, such as in the healing of the centurion's servant (Matthew 8:5-13). The centurion’s faith was rooted in his understanding that Christ could heal merely by His spoken word. This reflects a belief that the Word of God does not merely communicate information but leads to divine action. Additionally, in John 19:30, when Jesus declared, 'It is finished,' He demonstrated the fulfillment of His redemptive work; this declaration affirmed that sin was paid for. Therefore, the Christian faith rests on the confidence that when God speaks, He acts, and this is evident throughout Scripture, providing believers with assurance of salvation and healing.