How do we know the doctrine of the last days is true?

The certainty of the doctrine concerning the last days is anchored in the unchanging word of God and the prophetic revelations contained in scripture. Hebrews 1:2 notes that God has revealed His will in the last days through His Son, establishing a clear timeline for humanity's salvation. The warnings provided in the New Testament about the conditions of the last days serve not only as a guide for believers but also as evidence of God's foresight and control over history. The prevalence of mockers and the moral decline associated with this period corroborates scripture's warnings, reminding believers to remain steadfast in faith despite the surrounding disbelief.