The Body And Soul, By Ibn Al-Qayyim
The body of the son of Adam was created from the earth and his soul from the government of Heaven and then they were joined.
If he is hungry, stays awake, and keeps his body busy in serving Allah, his soul will find itself lighter and more peaceful so that it would long for the place from which it was created and miss its heavenly world. But if he secures food, blessings, sleep, and rest, the body will incline to remain at the place from which it was created and the soul would be pulled along with it and be in a prison.
If it was not for the fact that it would get used to that prison, it would ask for help, as a tortured person does, to find relief from the pain resulting from the separation and departure from its own world from which it was created.
[Al-Fawaa'id: A Collection of Wise Sayings]
