As we examine the Book of Hebrews, we see more and more that it was addressed primarily to Jewish Christians. In early chapters, almost from the beginning, Paul warned how easy it is to go out of the truth by letting things slip or by forsaking the assembling of ourselves together. Now, near the end of the book, he reverted back to his concern for converted Jews and the problems in maintaining their faith and in resisting sin in others as well as in their own fallen nature. Our three enemies are categorized as the world, the flesh, and the devil.