Its simple meaning is: "No doubt, this is the Book of Allah",

"This is the Book about which there is no doubt, a guidance for those conscious of Allah -"
(Glorious Quran 2:2)

Its simple meaning is: "No doubt, this is the Book of Allah", but it may also imply that this is the Book which contains nothing doubtful. It is not like the common books on metaphysics and religion which are based on mere speculation and guess-work. Therefore even their authors cannot be free from doubts concerning their own theories, in spite of their assertion that they are convinced of them. In contrast to them, this Book is based on the Truth: its Author is He Who possesses full knowledge of the Reality. Therefore, there is indeed no room for doubt about its contents.

That is, though there is nothing but guidance in this Book, there are a few pre-requisites for benefiting from it. The first pre-requisite is that one should be inclined to avoid vice, and should seek and practise virtue. But there is no guidance in the Qur'an for the people who do not bother to consider whether what they are doing is right or wrong, who follow the ways of the world or their own whims and lusts or move aimlessly in the ways of life.

Sadaq Allah...