Beyond the great state gods, each person had a personal god, an ili, who watched over them individually and explained private suffering or fortune when appeased or neglected.

Underneath the towering official pantheon of Mesopotamian religion, with its great temple households devoted to Marduk of Babylon, Ashur of Assyria, Enlil of Nippur and the rest, ran a second, more intimate layer of devotion that scholars call the personal god. Every individual, in this understanding, stood in a private relationship with a lesser or entirely personal deity, often a minor god otherwise unattested in the state pantheon, who functioned something like a patron, an intercessor and a conscience combined, watching over that one person's household, health and fortune specifically. Evidence for how seriously this relationship was taken comes above all from the ordinary record of personal names, since a very large share of Mesopotamian names are theophoric statements built directly around it, meaning roughly "my god has answered," "the personal god is my helper" or "trust in your personal god," turning something close to a private religious relationship into a piece of everyday identity carried by every namebearer.

Jeremy Black and Anthony Green's dictionary of Mesopotamian religion treats the personal god as one of the clearest points where official theology and lived religious practice diverge, since state temples devoted enormous resources to Marduk or Ishtar while an individual's daily anxieties and hopes were addressed, in practice, to this much smaller, closer figure.

The belief's sharpest expression appears in Babylonian wisdom literature that wrestles with the problem of unjust suffering, a body of poetry W. G. Lambert gathered and translated as Babylonian Wisdom Literature. In these compositions a righteous, pious sufferer, stricken with illness, poverty and social disgrace despite a lifetime of proper devotion, does not primarily blame Marduk or any of the great state gods for the disaster. Instead the crisis is framed as personal abandonment, the sufferer's own ili and ishtaritu having turned away or fallen silent, leaving them without the private intercessor who would ordinarily carry their case to the higher gods and shield them from demonic attack and misfortune.

This framing mattered practically as well as theologically, because it shaped what remedy the ritual and medical texts of the period actually prescribed. Rather than appealing directly to Marduk or Ishtar for restoration, healing and reconciliation rites regularly worked to identify which personal deity had been offended and by what specific failure, and to repair that one relationship first, on the understanding that health and fortune flowed through the personal god as intermediary rather than arriving from the great gods unmediated.