I have mentioned it elsewhere, but it is useful to recount the debate between Al-Qadi `Abdul Jabbaar of the Mu`tazilite sect, and the great Imam of the Sunnis of the time, Abu Ishaq Al-Isfaraayini . When the two met, `AbdulJabbaar said, “Exalted is Allah, who transcends the obscene.” (While this is a sound expression, what he meant to say was that Allah does not create evil. This is blasphemous, because Muslims must believe that Allah is the only creator, as it is stated in the Quran that He created everything, and that no one wills anything except by His Will.)
Imam Al- Isfaraayini (418 AH) realized what he had implied and responded, “Exalted is Allah, who nothing happens in His dominion but by His Will.” The Mu`tazilite then made another attempt and said, “Does our Lord like to be disobeyed?” Al-Isfaraayini quickly replied, “Could He be disobeyed against His Will?” Upon that `Abdul Jabbaar tried again to defeat his adversary and said, “If God denied me guidance, then ruled that I be destroyed for it, has He treated me fairly?” Al-Isfaraayini calmly answered, “If He denied you something that was yours, then He would have been unfair, but if it was not rightfully yours, then Allah does with His creation what He wills.” `Abdul Jabbaar fell silent, and could not argue further. After all, Allah is the true owner of all creation. (V.4/ P. 261-262. Tabaqaat-al-Shafi`iyyat-al-Kubra).