What is the central thesis of Hebrews 6:13-10:18?

What is the central thesis of Hebrews 6:13-10:18?
How does this perspective connect the NT to the OT?Part 2: Create a succinct and clear summary of your findings. How would you communicate your conclusions to a middle-school student? In the equivalent of two pages, double spaced, communicate the following:

What is the central thesis of Hebrews 6:13-10:18?
How does this perspective connect the NT to the OT?