Paul's Warning to the Christians to be Prepared for the Parousia.
1 Thessalonians 5:2. as a thief in the night: cf. the words of Jesus (Matthew 24:43). Throughout this paragraph the suddenness of the Parousia is emphasized.
1 Thessalonians 5:5. sons of light: a Hebraism, meaning those who have been enlightened.
1 Thessalonians 5:8. breastplate: cf. with this passage the fuller description of the Christian's armour in Ephesians 6:13-20.
1 Thessalonians 5:10. wake or sleep: i.e. whether we are alive or dead when the Parousia takes place.