Hebrews was written to Christians who were being persecuted, so the emphasize on the uniqueness of Christ is meant to comfort them. It is to let them know that now they have a high priest who can stand on their behalf and speaks for them. We too need to be comforted in these days that Jesus Christ is a better high priest and we can trust him. The best of world leaders would like the OT priests die and with them their best of ideas, but Jesus is a prophet with an eternal existence so we can always trust him. That is why we must persevere and not give up. At a time the world is in need of a trusted dependable leader the Christian man or woman, boy or girl can know one thing for a fact, we have a high priest who knows our weakness, sympathizes with us, has compassion for us, and is eternally working on our behalf at the father’s right hand in heaven. His word is the source not only of our salvation, but of light that shines away the darkness in us. The writer of the book of Hebrews in 4:12-13 said of the word of God; “For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart. Nothing in all creation is hidden from God’s sight. Everything is uncovered and laid bare before the eyes of him to whom we must give account.”

 Maybe this illustration by Lawrence will help put things in perspective for us:
The Word of God sheds light into the dark recesses of our understanding, making wise the simple. That is positive. But it also sheds its light into the dark corners, the hidden places of our heart. It exposes as well as enlightens, and that can be negative, depending on how we choose to respond to its probing and penetrating power. A young pastor of a church located in the mountains of Colorado found that the parsonage needed quite a bit of regular maintenance. The most recurring problem was an unreliable water system. His home was built over an old mine. Water was pumped from the mine to a holding tank under the 
 living room floor to be used for daily needs. On more than one occasion the pastor had to climb down into the cellar, a four-foot deep, dirt-floored crawl space, in order to repair the pump. Each time the breakdown occurred, the pastor ventured into the dark crawl space with flashlight and tools in hand, but he never relished the task. Beyond the fact that the faulty pump was an annoyance, the pastor had a phobia about spiders, and the cellar was just the place to find these little creatures. One day when the pump broke down for what was probably the sixth time, the pastor had an idea. He decided that it would be wise to install an electric light in the cellar to make his repair task a bit easier. He reasoned that if he had to do this repair every few weeks, he might as well have some light to work by. So, taking his flashlight, he shone the light around the cellar in search of an appropriate place to hang the light fixture. As he moved the beam, a clump of spider webs caught his eye. Something was hanging from the ceiling, almost totally encased in the webs. Slowly he pushed away the webs uncovering what they hid—a light bulb! He pulled the string and the entire cellar was illuminated. He was unnerved to discover that all around him were spiders. Well, this pastor did what any wise person in such a situation would do: He extinguished the light, finished his task, and got out of that cellar.

 As the light illuminated the cellar of the pastor’s house, exposing the webs and spiders, so too does the light of Scripture expose the webs and spiders in the cellar of our lives. And often, as the pastor did, we simply choose to extinguish the light rather than clean the cellar. One of the functions of the Bible is to be an exposing light in our lives. The Bible is a unique book in that it can shine into the very depths of the heart. 

One cannot hide from the probing Word of God. God uses it like a surgical instrument to reveal and expose the inner motives and attitudes we possess. Everything about us is in view before Him. The Scripture has a way of powerfully probing into our lives, not like a dead book of history, but as a living, active tool in the hand of God. 

 Richards, Lawrence O.; Bredfeldt, Gary, Creative Bible Teaching, (Chicago: IL, Moody Publishers, 1998), 1080, (Kindle Locations 1077-1080).