Do you know that when St. Matthew (3:4) writes that "John [the Baptist] wore a garment of camel's hair, and a leather girdle around his waist," he wants to say that Jesus is the Savior? Why? Because Elijah (or someone like him) was supposed to come before the Savior, and Elijah "wore a garment of haircloth, with a girdle of leather about his loins" (2 Kings 1:8).
Several groups of us realize that we need to learn the meaning in Scriptures if we want to appreciate them and want to use them for prayer. So we read some books, share what we find among ourselves, pray over them, and now we want to share them with others who are interested.
There are several caveats: often there are multiple possible interpretations of one passage, so what we write is not the only interpretation; the interpretation we choose might not be the best or the correct one; all interpretations are taken from the sources cited in the bibliography, but we eliminate footnotes to make the text easy to read; and we avoid many hard but rich topics, such as the title "Son of Man."