what the true sharia has imposed on him because it has promised him victory comfort and access to eternal bliss. if a doubter doubts this sharia and does not know it or is not certain of its correctness then he has no choice but to search and consider as much as he can. if he exhausts his capacity and effort without falling short or even failing then he will hardly be without the truth. if he is not and that is hardly the case then allah the most high is more deserving of pardon and forgiveness for him since he is not required to do what is beyond his capacity but rather his charge and burden glory be to him for his servants is much less than that.
ما فرضت عليه الشريعة المحقة، لأنها قد وعدته الفوز والراحة والوصول إلى النعيم الدائم. فإن شك شاك في هذه الشريعة ولم يعرفها ولم يتيقن صحتها فليس له إلا البحث والنظر جهده وطاقته. فإن أفرغ وسعه وجهده غير مقصر ولا وان فإنه لا يكاد يعدم الصواب. فإن عدمه ولا يكاد يكون ذلك فالله تعالى أولى بالصفح عنه والغفران له إذ كان غير مطالب بما ليس في الوسع بل تكليفه وتحميله عز وجل لعباده دون ذلك كثيرا