'Asceticism is the key to the door of the Hereafter and immunity from the Fire, and it is to abandon all those things that preoccupy you from Allah, neither experiencing regret upon their loss, nor self admiration for having abandoned them, nor awaiting deliverance from them, nor seeking praise on account of them, and nor anything else in exchange for them. Rather you see their loss as a source of comfort and their presence as a source of misfortune, such that you consistently run away from misfortune and seek refuge in comfort.'