In this passage, Jesus uses the Socrates method of elenchus by questioning the Pharisees and showing that their own beliefs are contradictory, and thus proving that they do not have knowledge in an area they thought they did.
Jesus healed a blind, mute, demon-possessed man (yeah, I know what else could go wrong). The crowds started to wonder if Jesus was the Messiah. The Pharisees, of course, could not have this, so they accused Jesus of casting out demons by “Beelzebul the ruler of the demons.” (Matthew 12:24 NASB)
Jesus answered them simply that a kingdom divided against itself could not stand, therefore reasoning would follow that Jesus could not possible be casting out demons by the ruler of demons.
Having already illustrated the illogical nature of their reasoning, he began to question them on their supposed knowledge. He also finished carrying the train of thought to its conclusion. “But if I cast out demons by the Spirit of God, then the Kingdom of God has come upon you.” (Matt 12:28 NASB)
He turned their denial of His deity into an affirmation of who He was, using simple logic.
This is my second contribution to Evangelical Outpost’s Jesus the Logician Project.
Update: The phrase “Jesus uses the the Socrates method of elenchus…” is not meant to infer that Jesus got His reasoning from Socrates, only that elenchus is generally attributed to Socrates. My wording was done for clarity’s sake (looks like I failed there). I apologize if anyone takes this to mean that Jesus was not the originator of His logic. Being the Creator of all things, He is the creator of logic and all logical devices.