Hebrews 12 continues to contrast the Law and salvation through Christ. God treats us as His children, which means He disciplines us for our benefit, “For the Lord disciplines the one he loves, and chastises every son whom he receives… for our good, that we may share his holiness”. Paul says that we should be encouraged by it, although at the time it “seems painful rather than pleasant, but later it yields the peaceful fruit of righteousness to those who have been trained by it.”
The inheritance we’ve been offered is not one of fear, unlike the “blazing fire and … tempest and the sound of a trumpet” that accompanied Israel’s receiving of the Law. Even Moses said “I tremble with fear” at that sight.
We have “come to … the city of the living God … to innumerable angels in festal gathering … and to Jesus, the mediator of a new covenant”. Paul concludes this idea by saying “let us be grateful for receiving a kingdom that cannot be shaken, and thus let us offer to God acceptable worship, with reverence and awe”.