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Or: "cannot find the [right] way" - implying that they are helplessly confused and cannot, therefore, grasp this basic demand of Islam; or, alternatively, that the message relating to this demand has not been adequately conveyed and explained to them.
If through physical, mental, or moral incapacity, we are unable to fight the good fight, we must nevertheless guard ourselves from it. Allah's gracious Mercy will recognise and forgive our weakness if it is real weakness, and not merely an excuse.