O son, I've been suffering from heartache of late. And I don't know a better person who could wake me up from vain preoccupation than the venerated Shaykh Abdul Qadir al-Jilani in his Jila' al Khatir (Purification of the Mind).________________________________________
Woe unto you! All that you are about and all that you are involved in is illusion within illusion which Allah will pay no attention to. This business does not come about through deeds of the body but rather through deeds of the heart. Our Prophet Muhammad (s.a.w) said: "Renunciation is here, fear of Allah is here, sincerity is here," and he pointed at his chest.
This heart would not be sound and would not achieve success until it has given up every beloved, cut off every object of attachment and renounced every creature. Give up and you will be rewarded with much better than what you abandoned. The Prophet s.a.w said: "When a person gives up something (for the sake of Allah) Allah compensates him with a better thing." O Allah, wake up our hearts so that they attend to you, awaken us from our forgetfulness of You and give us in this world good and in the hereafter good and protect us from the torment of the Fire!
When this heart has become sound and planted its feet firm at the door of the True One, it will fall in the wilderness of kun fayakun (Be, and it is), in its valleys and in its sea.
It will exist there sometimes with its words, sometimes with its aspiration and sometimes with its sight. It will become the action of Allah and it will become detached. It will remain only in essence. Only a minority of you believe in this, while the majority disbelieve it. Believing in this is sainthood and putting it into practice is attainment. No one would deny the spiritual states of the righteous ones other than a hypocrite, an impostor, one who is riding on his passion. This business is based on having sound belief and applying the outward of the Law which will cause the person to inherit knowingness of Allah and Knowledge of Him. The Law will come to be between him and creatures, while deeds will be as little as an atom in comparison with the mountain of his inward deeds. His limbs and organs will come to rest but his heart will never sleep. His heart will act and remember Allah while he is asleep. When will you come to know this world so that you give it up and divorce it?
Jila'a al-Khatir as translated by Prof Shetha al-Dargazelli & Dr Louay Fatoohi