Jewish Christians were being persecuted, in an attempt to comfort them the unknown author of Hebrews wrote them a letter, he points to Jesus. Just before his pen lifts from the page in conclusion, he illustrates for them two mountains. One which is dark, prone to violent storms and despair, and one which welcomes with 'thousands upon thousand of angels' (Heb. 12:22), the Kingdom of the living God.
Come down from the mountain of fear and step into the Kingdom of God.