"Indeed, the worst of living creatures in the sight of Allah are the deaf and dumb who do not use reason". (Quran al-Anfal 8:22)
"Do you think that most of them hear or reason? They are like livestock. Rather, they are [even] more astray in [their] way". (The Noble Quran 25:44)
Dumbing Us Down pdf: https://goo.gl/GCLZcG