To counter this accusation, Christ presented two critical arguments: first, if He were casting out demons by the power of Beelzebub, it would imply that Satan is at war against himself, a notion that is illogical, for such a scenario would spell the end of Satan's domain; secondly, if the Pharisees attribute His exorcisms to Beelzebub, they must also clarify how their own followers are able to cast out demons, which they refuse to do.
The Lord then accurately identifies the source of His miracles: they are enacted through the Holy Spirit, or as stated metaphorically in Luke, "by the finger of God." Consequently, the witnesses of these acts must arrive at the conclusion that the reign of Satan, who once tormented humanity but is now being expelled from their lives, is nearing its end, and the kingdom of God has been established. The subsequent verse underscores this necessity, indicating that if those bound by Satan are liberated, it signifies that the Stronger One, the Messiah, has entered into the stronghold of Satan, overpowering him and now liberating his captives.
Following this, Christ declared, "Whoever is not with Me is against Me, and whoever does not gather with Me scatters." This illustration, drawn from the harvest, can be seen as part of His rebuttal to the Pharisees' accusations regarding His exorcisms. Its implication is clear: there can be no common ground between Beelzebub and the Messiah, as a neutral stance towards Christ equates to opposition. Alternatively, if this statement is viewed in connection with what follows, it acts as a warning to those wavering between allegiance to the Pharisees and commitment to Christ. The request for a sign can be referenced in Matthew 12:38-45.