What does the Bible say about the authority of Christ's preaching?

In Matthew 7:28-29, we see that the crowd was astonished at Jesus' teaching because He spoke with authority. Unlike the scribes, who relied on human tradition and interpretation, Jesus taught directly from His divine nature and understanding as the Son of God. His authoritative preaching stems from His unique position as the ultimate prophet, fitting the biblical archetype found in Deuteronomy 18:15, where Moses foretold of a prophet like him, but greater. This divine authority allows Jesus to convey God's truth effectively, showing both the fullness of His revelation and the necessity for His followers to heed His words.