The writer of Hebrews exhorts his readers to stop remaining immature in their faith and to grow in their relationship with God.
The difference between the priesthood of Aaron and the priesthood of Christ is His sinlessness, whereby He is able to intercede on our behalf.
Because we have a great High Priest, we can come boldly to the throne of grace to find help in our time of need.
The writer of Hebrews uses the example of the Israelites to show how easy it is to harden our hearts and the necessity of keeping our hearts soft before God.
The antidote to a heart becoming hardened before God is to rest in the love and grace he has given us.
The reason Christ is superior to angelic beings is that He is the eternal Son of God.
God has spoken to humanity in the giving of His Son to be the Savior of the World.