Man's brain is the most complicated device in this universe to such an extent that it is even unable to comprehend itself and how it works. Furthermore, the most advanced computer on earth is not even close to one of billion of the potentials of man's mind. Why has Allah provided us with this intellectual device which is our judging means? He has created it to be our means to know Him, so if we use this mind for insignificant purposes, it will be like using the most advanced blood analyzing electronic machine as a coffee table. Is this rational? When someone uses this advanced machine as a coffee table, he is undermining it and putting all its potentials out of work, but if he uses it in a laboratory, he will gain lots of money.

 Similarly, using our reason which Allah has granted us in getting acquainted to Him, obeying Him and submitting ourselves to Him will make us happy in the worldly life and the Hereafter. Unfortunately, man uses his intelligence and mind just to earn money, to establish his position here or there and to gain greater wealth through lesser efforts. In fact, when man uses his mind and cleverness for purposes other than the ones he has been created for, he will regret it severely on the Day of Resurrection. Using one's reason to serve purposes that have nothing to do with the main purpose of his creation is like using a banknote, that worth 1000 million to calculate numbers on it and then throwing it away. In both cases man will regret committing such a deadly mistake; the latter regrets throwing the banknote, because it could make him and his family rich for the rest of his life. Likewise, man will regret using his mind for purposes other than the ones he has been created for.

The instinctive mind:

 There is an instinctive mind and an acquiring one, as for the former it is natural and innate, whereas the latter is the means to charge the mind with information. Man will be called to account for the way he uses his mind and Fitrah, given man's mind is enough means to get acquainted with Allah, whereas Fitrah (an inborn natural predisposition which cannot change, and which exists at birth in all human beings. It is inclined towards right action and submission to Allah, the One Deity) is the inner detector which distinguishes the right thing from the wrong one. Accordingly, if we suppose that someone never got the Message of Allah, he would still be called to account for the fundamentals of the religion which are recognized by the mind and Fitrah, but as for the details of the Divine Message, he would not be reckoned for not applying them (because he did not know them in the first place as he never got the Message of Allah).

 I would like you to know that the accurate fact is that Allah the Almighty takes upon His Entity the responsibility of guiding people. Allah says:

﴾Truly! Ours it is (to give) guidance,﴿

[Al-Lail, 12]

 Allah also says:

﴾And upon Allah is the responsibility to explain the Straight Path (i.e. Islamic Monotheism for mankind i.e. to show them legal and illegal, good and evil things, etc. so, whosoever accepts the guidance, it will be for his own benefit and whosoever goes astray, it will be for his own destruction)﴿

[An-Nahl, 9]

 This means that upon Allah is the responsibility of explaining the Strait Path to people. Allah also says in another Ayah:

﴾Had Allah known of any good in them, He would indeed have made them listen, and even if He had made them listen, they would but have turned away, averse (to the truth).﴿

[Al-Anfal, 23]

 Allah is the One Who guides people, and man will be called to account for his mind which must get him acquainted with Allah and for his Fitrah which is his means to know the right and the wrong things. Some of the scholars interpreted the following Ayah:

﴾That he or it (Muhammad PBUH or the Qur'an) may give warning to him who is living (a healthy minded the believer)﴿

[Ya-Sin, 70]

 They said that "who is living" is a reference to the prudent person.