“All who heard him
At his understanding
And his answers.”
ἐξίσταντο δὲ πάντες οἱ ἀκούοντες αὐτοῦ ἐπὶ τῇ συνέσει καὶ ταῖς ἀποκρίσεσιν αὐτοῦ.
Luke made a comment that will be often repeated here and in all the other gospel stories about how people were amazed or marveled at Jesus. He said that everyone, especially these religious teachers in Jerusalem, who heard this 12-year-old Jesus was amazed or astonished (ἐξίσταντο δὲ πάντες οἱ ἀκούοντες αὐτοῦ) at his understanding or intellect (ἐπὶ τῇ συνέσει) and his answers (καὶ ταῖς ἀποκρίσεσιν αὐτοῦ). He was a bright kid for his age. What else would you expect from Jesus? The idea of a brilliant youth was common among all ancient heroes. However, the gospel writers were restrained in this area, since this is the only canonical story or episode about the young Jesus.