“When a strong man,
Guards his castle,
ὅταν ὁ ἰσχυρὸς καθωπλισμένος φυλάσσῃ τὴν ἑαυτοῦ αὐλήν, ἐν εἰρήνῃ ἐστὶν τὰ ὑπάρχοντα αὐτοῦ·
Luke uniquely indicated that Jesus said that when a strong man (ὅταν ὁ ἰσχυρὸς), fully armed (καθωπλισμένος), guarded his castle (φυλάσσῃ τὴν ἑαυτοῦ αὐλήν), his property or possessions would be safe and at peace (ἐν εἰρήνῃ ἐστὶν τὰ ὑπάρχοντα αὐτοῦ). Both Mark and Matthew have the attack on the house that is in the next verse, but without the setup of guarding the castle as here in Luke. How do you guard your house or castle?