Even though it’s likely one of the earliest Christian documents, 1 Thessalonians makes it clear that Paul considers the suddenness of Christ’s return to be apparent to believers. “…for you know very well,” he writes in 1 Thessalonians 5:2, “that the day of the Lord will come like a thief in the night.” But he goes on, in verse 4, to describe a major aspect of what it means to be a follower of Christ: “But you are not in…