The Quran unequivocally declares Allah's comprehensive knowledge, stating He is Knowing of all things. This attribute means that nothing can be hidden from Him, whether in the heavens or on the earth from Allah nothing is hidden in the earth nor in the heaven. This divine omniscience extends to the deepest secrets within human hearts, as highlighted by the verse 3:29. This intimate knowledge is not merely a passive awareness but an active, encompassing understanding that penetrates beyond outward appearances.

The concept is vividly illustrated in the story of creation, where Allah informs the angels of His intention to place a "successive authority" on Earth. When the angels question whether this creation would "cause corruption therein and shed blood," Allah replies, Indeed, I know that which you do not know. This demonstrates that Allah's knowledge precedes and surpasses even the perceptive insights of His angels. Later, when Adam is taught the names of all things, surpassing the angels' knowledge, Allah reminds them, Did I not tell you that I know the unseen [aspects of the heavens and the earth? And I know what you reveal and what you have concealed]. Ibn Kathir explains that this refers to Allah's knowledge of both manifest and hidden matters, including Iblis's concealed arrogance. Tafsir al-Jalalayn further clarifies that the angels' statement, 2:32, is a recognition of their limited knowledge, which only exists by Allah's permission.

Allah's knowledge encompasses not only present and past events but also future occurrences and the hidden consequences of actions. He knows what is [presently before them and what will be after them]. This includes the intricate details of human biology, such as 13:8 or exceed]. His knowledge is so vast that if the sea were ink for [writing the words of my Lord, the sea would be exhausted before the words of my Lord were exhausted]. It is stressed that humans only encompass a fragment of His knowledge except for what He wills.

Allah's boundless knowledge is inextricably linked with His profound wisdom. The Quran states Allah Knows, while you know not, emphasizing that human perception of good and bad is often limited and imperfect. What may appear hateful to humans, like fighting, may hold unforeseen good, while what seems desirable may contain harm. Ibn Kathir explains this as Allah having better knowledge of the ultimate outcomes and what truly benefits humans in both this life and the Hereafter. This understanding cultivates trust in divine commands, even when their immediate wisdom is not apparent.

This divine wisdom extends to the challenges and trials that individuals and communities face. In the context of the Battle of Uhud, where Muslims suffered a setback, Allah reveals that such events occur “by God’s leave... that He might test what is in your breasts and purify what is in your hearts. And Allah is Knowing of that within the breasts”. Ma'arif-ul-Quran elaborates that this was not a punishment but an affectionate correction and training to distinguish sincere believers from hypocrites. Allah knows the intentions concealed within hearts, and His trials serve to manifest these inner realities, not to inform Him of something He doesn't already know.

The story of the selection of Talut (Saul) as king for the Children of Israel further illustrates this point. When the Israelites question his suitability due to his lack of wealth, their prophet responds that Allah has chosen him and 2:247 and Knowing]. This highlights that divine choices are based on a comprehensive knowledge of inherent capabilities and wisdom, which may not be immediately obvious to human observers.

The concept of Divine Knowledge serves as a powerful foundation for accountability, reminding believers that every action, intention, and thought is known to Allah. The Quran states, 2:270. This assurance, according to Ibn Kathir, signifies that Allah has perfect knowledge of all good deeds, rewarding them tremendously when performed sincerely. Conversely, His knowledge also encompasses evil deeds and intentions, ensuring that wrongdoers will face consequences. The verse Allah is Knowing of the wrongdoers emphasizes this aspect of divine justice.

Hypocrisy, in particular, is a state directly addressed by Allah's omniscience. Those who pretend to believe while harboring disbelief in their hearts cannot deceive Allah. The Quran exposes their inner state: They conceal [their evil intentions and deeds from the people, but they cannot conceal them from Allah, and He is with them in His knowledge when they spend the night in such as He does not accept of speech. And ever is Allah, of what they do, encompassing]. Ibn Kathir defines "Nifaq" (hypocrisy) as showing conformity while concealing evil, emphasizing that hypocrites deceive only themselves, as Allah is fully aware of their intentions. He even records the Prophet Muhammad's statement: "Whoever has the following three (characteristics) will be a pure hypocrite... Whenever he speaks, he tells a lie. Whenever he makes a covenant, he proves treacherous. Whenever he is entrusted, he breaches the trust" (Bukhari, Muslim).

Divine Knowledge also guides believers in understanding the importance of the Hereafter. The rewards and punishments described in the Quran are a manifestation of Allah's perfect justice, based on His complete knowledge of all deeds. Those who believe in Allah and the Last Day are admonished to remember their accountability, as Allah knows what is within yourselves, so beware of Him. This awareness encourages living with integrity and striving for righteous deeds, knowing that Allah is [fully Acquainted with what you do].

While Allah's knowledge is boundless, human knowledge is inherently limited. The Quran explicitly states, And mankind have not been given of knowledge except a little. This limitation is not a deficiency but a fundamental aspect of human existence, highlighting dependence on divine revelation for guidance. When the angels recognized Adam's superior knowledge, they declared, we have no knowledge except what You have taught us. This illustrates that all knowledge ultimately originates from Allah.

In matters of faith and unseen realities (Ghayb), humans are called to believe based on divine revelation, not solely on sensory perception or reason. As Ma'arif-ul-Quran explains, belief in the unseen involves accepting with complete certitude the statements made by prophets, out of trust in them, concerning things "not known to man in an evident manner, or which are not apprehensible through the five senses." Ibn Kathir further clarifies that "Iman is a general term that includes affirming and believing in Allah, His Books and His Messengers, and realizing this affirmation through adhering to the implications of what the tongue utters and affirms."

The Quran distinguishes between Muhkamat (clear, lucid verses) and Mutashabihat (allegorical verses whose definite meanings are not entirely clear). Only Allah knows the true interpretation of the Mutashabihat, and humans are cautioned against delving into them with "deviation" in their hearts, seeking discord or misinterpretation. Instead, those "firmly rooted in knowledge" acknowledge their limitations, saying, We believe in it; all of it is from our Lord. As Imam Ahmad recorded, the Prophet advised: "When you see those who follow what is not so clear of the Qur'an, then they are those whom Allah described, so beware of them" (Bukhari). This emphasizes humility in seeking knowledge and adhering to what is clearly revealed.

Divine Knowledge is a cornerstone of Islamic theology, reflecting Allah's absolute perfection and His just, wise governance of creation. It underscores human accountability, provides solace in times of uncertainty, and delineates the path of guidance through revelation, while humbly acknowledging the inherent limits of human understanding.