Question: If Allah’s power is eternal, why is creation not eternal as well?
Answer: Power is an eternal divine attribute, but things brought into existence through that power are temporal. The eternity of the attribute does not require every object of power to exist eternally.
مَا زَالَ بِصِفَاتِهِ قَدِيمًا قَبْلَ خَلْقِهِ
Allah has eternally possessed His attributes, even before creating anything.
Follow-up: Does the coming into existence of something new give Allah a new power?
Clarification: No. The new beginning belongs to the creature, not to a newly acquired perfection in Allah. The Creator’s eternity and the creature’s temporal origin remain distinct.