With the purpose being to convey instruction about and knowledge of Yahweh, the method is not random, individual narratives, but rather the use of patterns and cycles of history portrayed by each generation.
Therefore, we cannot look at isolated texts. We have to look at patterns, themes, and motifs, which reveal the "big picture" of Yahweh at work with his people.
Yahweh is always the focus, and each book contributes a new part of his unfolding plan.