The Fatal Combination: The Wind of Negligence and Desire!
Ibn al-Qayyim said:
If negligence of Allah and the hereafter is coupled with pursuit of desires, unadulterated evil is born. More often than not, these two ills are found together.
A careful study of the corruption permeating the private and public arenas of human life surely reveals that those two causes are at the bottom of it all.
Negligence stands in one's way towards comprehending the truth and seeing it with his mind's eye; therefore, he joins the misguided.
Pursuit of desire impairs his [natural] tendency to pursue the truth, his zeal to embrace it, and the passion to follow it; in which case one falls in the category of those who have incurred Allah's wrath.
From ‘Ibn al-Qayyim’s Letter to one of his Brothers’