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  • ArticlesOfTheIslamicFaithByGhazali, page : 265

and you say, "Allah willing," by way of expressing your

earnest desire.

The phrase has thus been transferred from one expressing doubt
to one which signifies desire. Also, in the same way is its
transfer to express courtesy and respect for remembering Allah
in all circumstances.

The third reason for the use of those qualifications arises from
doubt and means, "Allah willing, I am truly a believer",

since Allah spoke of some particular men as being true believers.

Consequently believers are divided into two groups: those who
are described as truly believers and those who are not. This
arises from doubt concerning the perfection of belief and
not its reality.