Quran 2:78 from Surah Al-Baqara on Divine Marvels.
وَمِنۡهُمۡ أُمِّيُّونَ لَا يَعۡلَمُونَ ٱلۡكِتَٰبَ إِلَّآ أَمَانِيَّ وَإِنۡ هُمۡ إِلَّا يَظُنُّونَ
English translation: And among them (are) unlettered ones (who) do not know the book except wishful thinking and not they (do anything) except guess
Transliteration: wamin'hum ummiyyuna la ya'lamuna al-kitaba illa amaniyya wa-in hum illa yazunnuna