"Now when they saw the boldness of Peter and John, and perceived that they were uneducated, common men, they were astonished."
Acts 4:13a ESV
"And they recognized that they had been with Jesus."
Acts 4:13b ESV
"But the third defense was greatest of all, the defense of a personal experience of Jesus Christ. Their message was no carried tale. They knew at first-hand that it was true; and they were so sure of it that they were willing to stake their life upon it."
William Barclay
They had the boldness to trust God to do something extraordinary with their ordinary.
"When they saw the boldness of Sugar Hill Church, and perceived that they were just a bunch of Christ following, people loving, Common, Ordinary folks, they were astonished... But they recognized that they had been with Jesus."