The book of Hebrews is a powerful New Testament declaration of faith in Messiah. It, along with Luke and Acts, is considered some of the finest and highest quality of Greek we have available from the ancient world. This quality of language and argument contributed to its inclusion in the canon despite the uncertainty of its authorship (who must at least be Jewish, given his knowledge and expertise of the practices- some have proposed Paul, Apollos, Silas or even Barnabbas)