Licha ya wajibu wa kutumia akili ili kufikia imani sahihi kwa Allah (swt), mwanadamu hawezi kufahamu mambo yaliyo nje ya mipaka ya hisia zake na uwezo wake wa kiakili. Hii ni kwa sababu akili ya mwanadamu imefungwa ndani ya mipaka isiyoweza kuvukwa, bila kujali inavyokua na kuendelea kukua, hivyo uwezo wake wa kufahamu ni mdogo. Kwa hiyo, akili itashindwa kufahamu kiini cha Allah (swt), kwa sababu Yeye yuko zaidi ya mwanadamu, uhai na ulimwengu, na akili ya binadamu haiwezi kufahamu kilicho zaidi ya mwanadamu. Hivyo, akili ya binadamu haiwezi kufahamu kiini cha Allah (swt). Hakupaswi kusemwa: mwanadamu anawezaje kumwamini Allah kwa akili yake wakati akili yake haiwezi kufahamu kiini cha Allah (swt)? Hii ni kwa sababu imani (iman) inahusu kuamini kuwepo kwa Allah (swt), ambaye kuwepo kwake kunafahamika kupitia kuwepo kwa viumbe vyake, yaani ulimwengu, mwanadamu na uhai. Viumbe hivi viko ndani ya mipaka ya kile akili inachoweza kufahamu, na hivyo mwanadamu amevifahamu; na kwa kuvifahamu, mwanadamu amefahamu kuwepo kwa muumba (wa vitu hivi) ambaye ni Allah (swt). Kwa hiyo, imani katika kuwepo kwa Allah ina msingi wa kiakili na iko ndani ya mipaka ya uwezo wa kiakili wa mwanadamu. Hii ni tofauti na kiini cha Allah (swt), ambacho hakiwezekani kufahamika kwa sababu Yeye yuko zaidi ya mwanadamu, uhai na ulimwengu, hivyo yuko nje ya uwezo wa akili yoyote. Akili haiwezi kufahamu kilicho nje ya mipaka yake kwa sababu ya kizuizi kilichomo ndani yake. Kizuizi hiki kinapaswa kuwa miongoni mwa mambo yanayoimarisha imani, wala si chanzo cha shaka na mashaka. Zaidi ya hayo, kwa kuwa imani yetu kwa Allah (swt) inafikiwa kupitia akili yetu, ufahamu wetu wa kuwepo kwake ni kamili. Kwa kuwa hisia zetu za kuwepo kwake zimeunganishwa na akili, basi hisia zetu za kuwepo kwake ni za uhakika kabisa. Hivyo, hili linatuletea ufahamu kamili na hisia thabiti ya sifa zote za Mungu zinazohusishwa na Muumba. Yote haya yanatushawishi kwamba hatutaweza kufahamu kiini cha Allah (swt), licha ya imani yetu thabiti kwake. Kwa hiyo, ni lazima tujisalimishe kwa yote aliyotujulisha, ambayo akili haiwezi kuyafahamu wala kufikia ufahamu wake. Hii ni kutokana na udhaifu wa asili wa akili ya binadamu, kwa vipimo vyake vya kiasi na vya mipaka, kufahamu kile kilicho nje yake; kwani kufahamu huko kungehitaji vipimo visivyo na mipaka wala kikomo, mambo ambayo binadamu hana wala hawezi kuyapata. Kuhusu dalili ya haja ya Mtume ﷺ, imethibitika kwamba binadamu ameumbwa na Allah (swt) na kwamba dini ni asili (fitra) ndani ya binadamu, kwa kuwa ni mojawapo ya silika zake. Basi binadamu, kwa maumbile yake, humtakasa Muumba wake, na utakaso huu ni ibada, ambayo ndiyo uhusiano kati ya binadamu na Muumba wake. Kuacha uhusiano huu bila mpangilio kutaleta fujo na kuabudu kisicho Muumba. Kwa hiyo, ni lazima uhusiano huu upangwe kwa mfumo sahihi ambao hauwezi kutoka kwa binadamu, kwa sababu hawezi kufahamu hali halisi ya Muumba ili kuweka uhusiano huu baina yake na Muumba. Hivyo, mfumo huu lazima utoke kwa Muumba. Kwa kuwa Muumba ndiye anayepaswa kumfikishia binadamu mfumo huu, basi lazima kuwepo na Mitume ﷺ wa kuwafikishia watu dini ya Allah (swt).
Despite the obligation to use the mind to arrive at the correct belief in Allah (swt), man is unable to comprehend things beyond the boundaries of his senses and mental faculty. This is because man's mind is limited within boundaries it cannot surpass regardless of how much it develops and grows, hence, its ability to comprehend is limited. Therefore, the mind will fall short of comprehending the essence of Allah (swt), because He is beyond man, life and the universe and the human mind cannot comprehend what is beyond man. Thus the human mind is unable to comprehend the essence of Allah (swt). It should not be said how does man believe in Allah with his mind while his mind cannot comprehend the essence of Allah (swt). This is because belief (iman) entails iman in the existence of Allah (swt), whose existence is comprehended through the existence of His creation, i.e. the universe, man and life. These creations are within the limits of what the mind can comprehend and thus, man comprehended them; and from comprehending them, man comprehended the existence of a creator (for these things) who is Allah (swt). Therefore, iman in the existence of Allah is rational and within the limits of man's mental capacity. This is in contrast to the essence of Allah (swt), which is impossible since He is beyond man, life and the universe and hence He is beyond the capability of any mind. The mind is unable to comprehend what is beyond its bounds because of its inherent limitation to do so. This limitation should be one of the factors which strengthen the iman and not a source of suspicion and doubt. Moreover, since our iman in Allah (swt) is reached through our mind, our comprehension of His existence is complete. Since our sensation of His existence is linked with the mind, then our sensation of His existence is absolutely sure. Thus, this initiates in us a complete comprehension and assured feeling of all the divine attributes associated with the Creator. All of this convinces us that we will be unable to comprehend the essence of Allah (swt), despite our firm iman in Him. Therefore, we have to submit to all that He has informed us about, of which the mind is incapable to comprehend or to arrive at its comprehension. This is due to the natural inability of the human mind, by its relative and limited standards, to comprehend what is beyond it; for this comprehension would need absolute and unlimited standards, matters which man neither possess nor can acquire. As for the proof of the need for Messenger (saw)s, it has been proven that man is created by Allah (swt) and that religiousness is innate (fiTri) in man, since it is one of his instincts. Thus, man, by his nature, sanctifies his Creator, and this sanctification means worship, which is the relationship between man and his Creator. Leaving this relationship without organisation will lead to turmoil and to worshipping other than the Creator. Therefore, it is necessary to organise this relationship with a correct system which cannot emanate from man, because he cannot comprehend the nature of the Creator in order to set up this relationship between himself and the Creator. Hence, this system must come from the Creator. Since the Creator has to convey this system to man, therefore there should be Messenger (saw)s to convey to the people the deen of Allah (swt).