فَلَا تَضْرِبُوا لِلَّهِ الْأَمْثَالَ
Do not set up comparisons for Allah.
The prohibition prevents people from inventing comparisons that misrepresent Allah’s reality. A Qur’anic illustration clarifies a meaning; it does not establish that the divine essence is a counterpart to an object.
The illustration in “the likeness of His light” and the principle “nothing is like Him” are compatible. Explanatory purpose must be distinguished from real equivalence of essence or attributes.