Luke 4:32

‘And they were astonished at his teaching, for his word was with authority.'

And as the people listened to Him they were astonished at His teaching because His word was with authority. He spoke with power in the Holy Spirit, and He did not just cite other authorities like the Rabbis did, for they constantly referred back to the traditions of the Elders. He said quite boldly, ‘I say unto you' (see Matthew 5:22; Matthew 5:27; Matthew 5:32; Matthew 5:34; Matthew 5:39). He was an authority in Himself like a true Prophet.

Notice the priority given to His teaching. That is why He has come (Luke 4:43 compare Luke 8:1). Everything else is secondary. In Luke 9:2 the Apostles are sent out having been given authority over evil spirits and to cure diseases in order ‘to preach the Kingly Rule of God and to heal'. By Luke 10:1. He is sending out seventy to go ahead in order to prepare for His arrival.