if a blind person suddenly sees and sees colors he does not know that the light of the sun is the reason for their impression in his sight. rather we will explain this with an example which is that if a blind person had a cataract in his eye and did not hear from people the difference between night and day and the cataract was removed from his eye during the day and he opened his eyelids and saw colors he would think that the perception that occurred in his eye of the images of colors was caused by the opening of his sight and that no matter how sound and open his sight was the veil
فالأكمه إذا بصر فجأة ورأى الألوان لا يعلم أن نور الشمس هو السبب في انطباعها في بصره بل نبين هذا بمثال وهو أن الأكمه لو كان في عينه غشاوة ولم يسمع من الناس الفرق بين الليل والنهار لو انكشفت الغشاوة عن عينه نهارا وفتح أجفانه فرأى الألوان ظن أن الإدراك الحاصل في عينه لصور الألوان فاعله فتح البصر وأنه مهما كان بصره سليما ومفتوحا والحجاب