The Kingdom
For the carrying on of this spiritual warfare by which the knowledge of oneself and of God is to be obtained, the body may be figured as a kingdom, the soul as its king, and the different senses and faculties as constituting an army. Reason may be called the vizier, or prime minister, passion the revenue-collector, and anger the police-officer. Under the guise of collecting revenue, passion is continually prone to plunder on its own account, while resentment is always inclined to harshness and extreme severity. Both of these, the revenue-collector and the police-officer, have to be kept in due subordination to the king, but not killed or expelled, as they have their own proper functions to fulfil. But if passion and resentment master reason, the ruin of the soul infallibly ensues.
From “The Alchemy Of Happiness” by Imam Ghazali.