وَلَا يَقْدِرُ عَلَى أَكْثَرَ مِنْ وَاحِدٍ
Nor, on that view, can He produce more than one.
This is connected with the classical philosophical maxim الواحد لا يصدر عنه إلا الواحد—from one, only one directly proceeds. Applied without qualification to God, it appears to restrict the multiplicity of His effects.
The reply asks whether unity of essence means absence of every attribute or relation, and whether a rule for an impersonal cause can be established for a freely acting creator.