Hebrews 12

18 In Exo 19, the Israelites gather at Mount Sinai to receive the Ten Commandments. God's presence was accompanied by fire, smoke, thunder, and the voice of God. These were all observable signs that God was really on the mountain.
22 The Christian focuses less on the experience of the Israelites and more to the saving work of Jesus. Our goal is Mount Zion, to dwell in the presence of God. Our Promised Land is not merely Canaan, but the New Jerusalem. We are no longer anchored to Mount Sinai and the nearly impossible requirements of the Mosaic Law. The Law attempts to control behavior by external force, but we are given the Holy Spirit to motivate us to godly obedience from the inside.
23 The Israelites were commanded to stay away from the mountain where God was, but the Christian is invited into God's presence. The new Christian becomes a member of the Church, which acts as Jesus' body on earth. While the Israelites were often separated from God, the Christian has the intimate indwelling presence of God.
24 Abel was the first to offer a sacrifice that was pleasing to God. However, Jesus' sacrifice is far more important because it can not only pay for the sins of all people who believe, but also change their character.
25 The First Covenant of the Mosaic Law has lesser value than the Second Covenant of Jesus' blood. Since faith in the First Covenant was a matter of life and death, the Second must be considered even more so.
26 The verse referred to is Hag 2:6-7. God's appearance on Mount Sinai shook the earth, but Jesus' Second Coming will be so profound that the earth and heaven will shake.
27 The author emphasizes the phrase "once more" to indicate that there will be a Judgement Day followed by permanent stability. God has promised to establish Jesus' kingdom permanently (Isa 9:7).
28 God has promised us a wonderful, good, and permanent salvation. We should accept this gift and respond with reverence and obedience.