Mark 1: 21-28, An Amazing Teacher!

Capernaum is near Nazareth, in northern Israel (Galilee.)  Jesus first begins teaching, as any Jew would, in a synagogue, on the Sabbath (Saturday.)

Mark 1:21-22, A different teacher!
They went to Capernaum, and when the Sabbath came, Jesus went into the synagogue and began to teach. 
22 The people were amazed at his teaching, because he taught them as one who had authority, not as the teachers of the law. 

The teaching of Jesus has is observed as having a different authority, a different atmosphere. The teachings of Jesus focused on the true intent of the God and the Scriptures, instead of the regimentation of the Law and its many additions.

Jesus's teachings are received with "amazement". Will the people follow?

Mark 1:23-26, An unclean spirit

Just then a man in their synagogue who was possessed by an impure spirit cried out, 
24 “What do you want with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God!”
25 “Be quiet!” said Jesus sternly. “Come out of him!” 
26 The impure spirit shook the man violently and came out of him with a shriek.

Jesus is interrupted by a man "with an impure spirit".  (NIV footnotes say "evil spirit" might be "unclean spirit".)

The interruption acknowledges who Jesus is, but Jesus confronts the spirit and, according to the witnesses, leaves the man with a shriek.

Why does Jesus hush up the spirit?!

Mark 1:27-28, A different teacher!

The people were all so amazed that they asked each other, “What is this? A new teaching—and with authority! He even gives orders to impure spirits and they obey him.” 
28 News about him spread quickly over the whole region of Galilee.

The authority in the teaching has been demonstrated by the command Jesus has over the spirit.

Of course, news spreads!  Is this good?