God made the New Covenant because Jacob's offspring did not have what it took to fulfill the terms of the Old Covenant. The carnal mind is hostile to God's law.
We are being trained to become leaders, but before we can lead, we must be able to carry out responsibilities, conforming to God's leadership and covenants.
The fault of the Old Covenant was with the hearts of the people. Christ took it upon Himself to amend the fault enabling us to keep the commandments.
God is at work producing leadership in an organization that will follow Him, calling people into His family, carefully crafting it into a perfect organism.
Although God never intended the Old Covenant to endure eternally, the spiritual law (shared by both the old and new covenants) lasts forever.
Those who believe in the "once saved always saved" doctrine fail to see that God has a more extensive and creative plan for mankind than merely saving him.
The socio-cultural milieu before the writing of Hebrews created difficulties for the Jewish converts to the Gospel, who were deemed to be traitors.