Human Heedlessness and Lack of Knowledge

وَمَآ أَرْسَلْنَـٰكَ إِلَّا كَآفَّةً لِّلنَّاسِ بَشِيرًا وَنَذِيرًا وَلَـٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ

And We have not sent you except comprehensively to mankind as a bringer of good tidings and a warner. But most of the people do not know.