“The nafs calls one to tyranny and & preferring the life of the dunya, & the Lord calls the servant to fear Him & forbids the nafs from its evil desire. As such, the heart ends up between the two callers; sometimes it inclines to this caller & other times to the other caller, & this is the very object of ordeal & tribulation.” -Ibn al-Qayyim [Ighāthah al-Lahfān 1/126]