'Mighty' in the Bible

When the Sabbath came, He began to teach in the synagogue; and many who listened to Him were astonished, saying, “Where did this man get these things [this knowledge and spiritual insight]? What is this wisdom [this confident understanding of the Scripture] that has been given to Him, and such miracles as these performed by His hands?

King Herod [Antipas] heard about this, for Jesus’ name and reputation had become well known. People were saying, “John the Baptist has been raised from the dead, and that is why these miraculous powers are at work in Him.”

But Jesus said, “Do not stop him; for there is no one who will perform a miracle in My name, and be able soon afterward to speak evil of Me.