AAallama al-insana ma lam yaAAlam (surah Al Alaq: 5)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(96:5) taught man what he did not know. *6

Al lamal insaana ma lam y`alam

*6) That is, Man originally was absolutely illiterate. Whatever of knowledge he obtained, he obtained it as a gift from Allah. Whatever doors of knowledge at any stage did Allah will to open for man, they went on opining up before him. This same thing has been expressed in the verse of the Throne, thus: "And the people cannot comprehend anything of His knowledge save what He Himself may please to reveal." (Al-Baqarah: 255). Whatever man looks upon as his own scientific discovery was, in fact, unknown to him before. Allah gave him its knowledge whenever He willed without his realizing that Allah by His grace had blessed him with the knowledge of it.
These verses were the very first to be revealed to the Holy Prophet (upon whom be peace), as is stated in the Hadith reported by Hadrat `A'ishah. This first experience was so intense and tremendous that the Holy Prophet could not bear it any more. Therefore, at that time he was only made aware that the Being Whom he already knew and acknowledged as his Lord and Sustainer was in direct communion with him, had started sending down Revelations to him, and had appointed him as His Prophet. Then after an intermission the opening verses of Surah al-Muddaththir were revealed in which he was told what mission he had to perform after his appointment to Prophethood. (For explanation, see Introduction to Al-Muddaththir)