Anytime you travel overseas, a passport is required. Your passport is a document of citizenship, denoting your country of origin and permanent residence. Your name is written on that document along with your place and date of birth. Jesus said that our names are written in heaven (see Luke 10:20) because we have been born again. That makes us tourists and foreigners here on earth. In this section of Philippians, Paul gave us four distinguishing characteristics of heavenly citizens.