Except what Allah wills thee to forget ??
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Thank you all for your comments/suggestions.
Just wanted to share another interpretation that has been suggested
"And Allah created you; then He will take you in death. And among you is he who is reversed to the most decrepit age so that he will not know, after knowledge, a thing. Indeed, Allah is Knowing and Competent." 1670
Allah has willed that when a man reaches old age he ".. will not know, after knowledge, a thing."
This is the will of Allah mentioned in 876-7 i.e. Allah will make the addressee read and he will not forget, except what Allah has willed i.e. the phenomenon mentioned in 1670 that when man reaches old age he becomes forgetful.
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This is what is ensured about the Messenger that he will never be in this category.
Know it that Allah the Exalted has created you people. Afterwards , He alienates/segregates you people
However, there is someone living amongst you who is made to regressively return towards the relatively dependent-feeble of the period of life culminating at nethermost-non verbal infancy.
The explanation-reason-effect of regression is that henceforth he might not trace/separate/locate/ acknowledge-retrieve knowledge of something, after having attained knowledge.
It is a certain fact that Allah the Exalted is eternally the all-Knowing, eternally the dominant.Read about Alzheimer.
http//free-minds.org/forum/index.php?topic=14947.msg139905#msg139905