How do we know the power of Jesus over demons is true?

The authority of Jesus over demons is firmly established in the Gospels, where numerous accounts document His miraculous works. The incident in Luke 11:14-20 illustrates His power as He casts out a mute spirit, leading witnesses to either marvel or respond with skepticism. Jesus countered the charges against Him by exemplifying the absurdity of Satan fighting against himself. His miracles serve as a testament to the advancement of God's kingdom and the definitive defeat of evil. Such events underline the truth that Jesus possesses sovereign dominion over all spiritual powers.