distinguishing between wisdom and foolishness

قَالَ يَـٰقَوْمِ لَيْسَ بِى سَفَاهَةٌ وَلَـٰكِنِّى رَسُولٌ مِّن رَّبِّ ٱلْعَـٰلَمِينَ

[Hūd] said, "O my people, there is not foolishness in me, but I am a messenger from the Lord of the worlds.