In these two feeding accounts, Mark signals to his primarily listening audience a portion of his books structure and point.
(This is probably the most overlooked aspect of our study of the bible's stories and should be considered carefully. Please see this video for a visual and more detailed discussion of how and why stories in the ancient world used aural signals to indicate structure.)
While visual signals such as chapter numbers and verses, section titles, paragraph indentations, highlighted words etc. help modern readers orient themselves to a stories structure and point, ancient books had no graphic signals, not even spaces between words. Literacy was relatively rare and thus visual cues on the page were deemed far less important than giving meaning to the work through aural signals.
Private reading, which we of course enjoy today, does not require repetition since we have the ability to go back and check what we've just read. But an aural culture, one that learns and memorizes through hearing, demands it. A point is highlighted and emphasized in repetition. Think of Martin Luther King's "I Have Dream" speech. For Mark, these type of parallels proved crucial for indicating his structure and by extension his message.
David A. Dorsey in his book the Literary Structure of the Old Testament offers a list of the ways matching conveys meaning. Among them are
- Emphasis: matching can emphasize a point by reiterating it...
- Comparison: two or more units may be matched in order to
draw out the similarity of two things not readily seen as similar...
- Contrast: conversely, matching may highlight the contrast between
two things that are in some respects alike...
- Reversal: matching may highlight the reversal or undoing of something...
- Resolution (or fulfillment): an author may highlight the close connection between story's opening tension, suspense, or prediction and its closing resolution or fulfillment, by placing the two in matching positions at the beginning and end of the story...
- Totality: matching units may convey
the idea of the totality of a phenomenon by featuring both halves of
a merism (day and night, man and woman, etc.)...
Depending on the precise arrangement of these matching sections there may be other ways as well.
Mark's accounts of the two feeding form part of a literary unit between 6:7 and 8:22. The repeated emphasis in this section revolves around the topics of eating, bread, purity codes, gentiles and miracles related to hearing and seeing.
Taken together, as Mark's structure demands, Mark appears to be making a point through these stories about the disciples total insufficiency but Christ's all-sufficiency to feed/save the world. And that includes gentiles, hinted at in the Syrophoenician (gentile) woman's request for bread crumbs. The subtle difference between the two feedings, such as the number of baskets of bread left over and even the different greek words used for baskets indicates that Jews are in mind in the first feeding while Gentiles are in view in the second.