How do we know Jesus has power over evil spirits?

In the account from Mark 5, Jesus demonstrates His absolute authority over evil spirits when He casts out the demons from the possessed man. When confronted by the man inhabited by a legion of demons, the evil spirits immediately recognize Jesus's authority and plead for mercy, acknowledging His power to torment them. This encounter reveals that even the forces of darkness are under His sovereign control. Throughout Scripture, including passages like Matthew 8:16 and Luke 8:27, we see Jesus exercising His authority over demons consistently, showing that He has dominion over all spiritual realms. This highlights an essential truth of historic Reformed theology: that Christ is sovereign and His power extends over all creation, including demonic forces.