The hearts of the hypocrites are (afflicted) with the sickness of doubt and illusion. The hearts of the disobedient ones are (afflicted) with the sickness of deviation and lowly desires. Indeed, Allaah referred to all of them (i.e. doubt, illusion, deviation and lowly desires) as diseases.

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[Source: Badaa’i At-Tafseer Al-Jaami Limaa Fassarahu Al-Imaam Ibnu Qayyim’ Vol 1. pagePage 96]