What does the Bible say about signs that follow believers?

In Mark 16:17-18, Jesus promises that signs shall follow those who believe, empowered by His authority. These signs include casting out demons, speaking in new languages, and healing the sick. This is asserted as a distinct characteristic of true believers who fully trust in the gospel of Christ. Mark emphasizes that these signs are manifestations of God’s power and confirms the truth of the gospel being preached. They are not merely for personal validation but serve to authenticate the message of salvation through Jesus Christ.