In the context of this book, Ibn Qayyim argues that the primary "disease" is . However, he is more specific. He posits that the root of all misery is Shirk (associating partners with God) and Ma’siyat (disobedience).
Further reading (short list)
) by Imam Ibn al-Qayyim al-Jawziyya is widely regarded as a spiritual masterpiece that functions as a manual for purifying the heart and soul. Dar-us-Salam Islamic Bookstore Core Premise and Context ibn qayyim the disease and the cure pdf