How did Midrash develop as a form of biblical commentary?

Midrash developed as a sophisticated system of biblical interpretation, evolving from a basic philological method into a complex tool for reconciling contradictions, establishing legal foundations, and enriching scriptural meaning.1

Initially, Midrash functioned as an investigation into the literal meaning of texts. Over time, it expanded into two primary interpretive directions:12
* Legal (Halakhic): Rabbinic schools used exegesis to apply Scripture to problematic situations, recording these findings in terse legal forms.2
* Homiletic (Haggadic): These interpretations originated from weekly synagogue readings and evolved into collections of narratives, ethics, and theological teachings.34

The methodology reached its peak in the schools of Rabbi Ishmael and Akiba. While Ishmael’s school favored logical inferences based on analogy, Akiba’s school focused on textual scrutiny, assuming that even seemingly superfluous words or letters contained hidden meaning. This analytical process fostered "organic thinking," where concepts grew and changed meaning through their interweaving within the broader pattern of rabbinic thought. By the 3rd and 4th centuries, these discussions were systematically compiled and organized according to the order of biblical verses.12