The document discusses three types of hearts: 1. The healthy heart is cleansed from passions that contradict Allah's commands and seeks judgement only from Allah and his messenger. It exclusively serves Allah willingly. 2. The dead heart does not know or worship Allah as commanded and instead clings to lusts and desires. It worships things other than Allah. 3. The sick heart has both life (faith in Allah) and illness (cravings for lust). It follows whichever (faith or cravings) dominates it at a given time.