The Pharisees and Sadducees came, and to test him they asked him to show them a sign from heaven. I. As a master teacher, Jesus repeated himself often. Don't be afraid to repeat yourself. II. Do be afraid of being a Pharisee or Sadducee. III. To put Jesus to the test, to demand he prove himself, is evidence of a hard heart that refuses to trust in him. IV. Jesus exposes them for their worldly wisdom but spiritual blindness. V. An evil and adulterous generation seeks for a sign. VI. The most significant proof of Christianity is the death and resurrection of Jesus.