“Fear Allah as He should be feared” (Āl ʿImrān 3:102) is compared with “Fear Allah as much as you are able” (al-Taghābun 64:16).
The first expression stresses the seriousness and quality of devotion; the second articulates the practical limit of individual ability. They need not contradict each other. The believer should strive fully while remaining subject to the legal and moral limits of capacity.
Distinguishing the ideal being sought from the capacity within which action is required yields reconciliation rather than necessary abrogation.