“And now, behold, the hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season. And immediately there fell on him a mist and a darkness; and he went about seeking some to lead him by the hand. 12Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord.” Acts 13:11-12
It is one thing to teach or make known to others, the doctrine of the Lord, it is another thing to astonish them with doctrine.