إن المقدور الواحد داخل تحت قدرتين لكن بجهتين مختلفتين
A single possible act falls under two powers, but in different respects.
Its existence and origination are ascribed to God's power, while its voluntary acquisition is related to the servant's created capacity. This does not posit two independent creators, because the respective relations do not mean the same thing.
If creation and acquisition are treated as identical, the argument wrongly moves toward either denying choice or assigning humans independent creative power. Identifying the distinct respects avoids this false alternative.