The heart is healthy only when it is functioning contrast to it's desires. in other words, desires are the sickness of the heart and opposing them is the cure..!

Those who desire are three types:

*Those who desire Allah,

*Those who desire what Allah has,

*And those who desire other than Allah.

So the lover is the one who desires Allah. The one who is concerned with works is the one who desires what Allah has. And the one who is satisfied with his life, in neglect to the Hereafter, is the one who desires other than Him”.

~ Imam ibn Qayyim al-Jawziyya ~