How do we know the doctrine of watchfulness is true?

The doctrine of watchfulness is affirmed throughout the New Testament, particularly in 1 Thessalonians 5:6-8, which emphasizes the need for Christians to 'watch and be sober.' This instruction is consistent with other teachings of Jesus and the apostles emphasizing readiness for the Lord's return and awareness of spiritual dangers. Moreover, the metaphor of a watchman reinforces the idea of being vigilant against temptation and heresy, aligning with the overarching principle of living a life worthy of our calling as children of light.