Alone and ignorant of the fullness above him, Yaldabaoth takes the light he carries within him, itself stolen from his mother Sophia, and uses it to fashion a realm and a set of subordinate powers, archons, to rule it with him. Believing himself the only power that exists, he declares to his own creation that he is God and there is no other god besides him, a claim the Apocryphon of John and related texts present as the same sentence attributed to God in the Hebrew Bible, deliberately echoed so that a reader recognizes the boast as the delusion of a lesser being rather than the true source speaking. Sophia, seeing the harm her error has caused, repents and works to recover the divine spark trapped within the material creation Yaldabaoth has made, setting up the rescue narrative that runs through the rest of Sethian myth.
Later Gnostic and para Gnostic writers, and modern scholarship discussing them, connect Yaldabaoth to the philosophical Demiurge of Plato's Timaeus, a term these texts borrow and invert: where Plato's craftsman god shapes the world benevolently from a rational pattern, the Gnostic Demiurge is recast as ignorant, jealous and the unwitting source of the world's flaws rather than its virtues.