Before Jesus tells the scribes a parable, he presents them with a logical argument: why would Satan rise up against himself? Logically it does not make any sense for Satan to fight and destroy himself. Because if Jesus was possessed by Satan as they claim, then by driving out demons, Satan would be weakening and destroying his own kingdom.
26 Si donc Satan se révolte contre lui-même, il est divisé, et il ne peut subsister, mais c'en est fait de lui.