Created states may pass away: a learner can forget, a strong person can become weak, and one condition may give way to another.
Incapable of remaining (mustaḥīl al-baqāʾ) describes something whose persistence is impossible. Denying that description of divine attributes emphasizes their enduring, unoriginated perfection. The point is not merely that knowledge and power happen to be present now.
Two claims must be distinguished: affirming the attribute, and affirming its eternity and continuance. The first establishes a perfection; the second denies its origination and disappearance.