The book of Hebrews is unique; its style is distinct from that of other letters in the New Testament. Though we don't know who wrote Hebrews or exactly to whom it was written, it's clear that the book was written to believers in Jesus who had become exhausted. They were tired of being Christians, tired of suffering for their faith, and tired of waiting for Jesus to come back. In their burned-out state they were in danger of drifting in their journey with God. So the writer of Hebrews aims to encourage these believers to hold on, in God's strength, by refocusing on the author and founder of their faith the Lord Jesus Christ.