Imaam Ibnul Qayyim (rahimahullaah) said:

Everyone with a grasp of common sense knows that the corruption and devastation of the world occurs due to giving precedence to opinion over (Allaah’s) revelation and desires over sound (uncorrupted) intellect.  These two corrupt (affairs) do not get hold of the heart except that its destruction is established….

[A’laam Muwaqqi-een 1/67]