The book of Hebrews is described as a “word of exhortation” (Hebrews 13:22). This has to do with both the form and the function of the book. In its form it is a written sermon with an epistolary ending. It is also an “exhortation” in function. The correspondence is an exhortation to faithfulness and progression. The congregation has become “dull of hearing.” They is a legitimate possibility of “falling away.” Our writer takes these dangers seriously and therefore wants to respond to them forcefully.