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  • ArticlesOfTheIslamicFaithByGhazali, page : 213

The same is true of verbal confession as well as of obedience
and compliance with the senses. According to the dictates of
language Islam is the more general term, while belief is the
more specific. Therefore belief (Iman) represents the noblest
part of Islam.

Consequently every acceptance is submission, but not every submission
is acceptance.

The second consideration treats the technical meaning of the
two terms in the Koran and prophetic quotations.

The truth of the matter is that the Religion i.e. the Koran and
prophetic quotations, has used the two terms as synonyms
interchangeably, as different terms of different meaning, and
as related terms, one being a part of the other.

Their use synonymously is shown in the Words of Allah when He
said, "So We brought the believers out of that they were in.