What does Hebrews 13:22 mean?

The book of Hebrews is really a letter, written to persecuted Jewish Christians. Over the course of this letter, the writer explains how the Old Testament Scriptures predicted the coming of Jesus Christ. He showed how the new covenant offered by Christ was always God's plan for mankind's salvation. The rituals and sacraments of the old covenant were really meant to symbolize the perfect work of Jesus on our behalf. Given all of this, and the examples of faith we see in history, Christians ought to "hold fast" to their faith and not succumb to the pressures of persecution.

Everything to this point in Hebrews has been part of a rich, interwoven, profound look at the meaning of the new covenant and why it is worthy of our trust. And yet, here the writer asks for patience from the readers, since he has only scratched the surface of these topics. Earlier, he had noted that there were many ideas which also needed explanation, but for which he had no time (Hebrews 5:11––6:1; 11:32). Now, the writer again acknowledges that this letter is only a brief account of these amazing truths.