The heart of whoever is drowned in the pleasures of this world and its attractions is distracted from remembering death — and if someone mentions death to him, he hates it and runs away from it. As regards such people, Allah says:
“Say: ‘Death from which you are fleeing will certainly catch up with you. Then you will be returned to the Knower of the Unseen and the Visible and He will inform you about what you did.’“ – Quran [62:8]
You should know that all acts of disobedience are poison to the heart and cause its sickness and ruin. They result in its will running off course, against that of Allah, and so its sickness festers and increases. Ibn Al-Mubarak said:
I have seen wrong actions killing hearts, and their degradation may lead to their becoming addicted to them. Turning away from wrong actions gives life to the hearts, and opposing yourself is best for it.
Whoever is concerned with the health and life of his heart, must rid it of the effects of such poisons, and then protect it by avoiding new ones. If he takes any by mistake, then he should hasten to wipe out their effect by turning in repentance and seeking forgiveness from Allah, as well as by doing good deeds that will wipe out his wrong actions.
By the four poisons we mean unnecessary talking, unrestrained glances, too much food and keeping bad company. Of all the poisons, these the most widespread and have the greatest effect on a heart’s well being.
Ibn Al-Qayyim said with regards to what one should do to cure his weak Iman using the Quran;
“First you should remove your heart from the life of this world and settle it in the Last Life. Then, pay your full attention to pursuing the meanings of the Quran, and try to comprehend and understand them and what they were sent down to accomplish. Then, offer these meanings to the sickness that your heart feels, and when they touch the disease, they will cure the heart, Allah willing.“
“The one with a dead heart will make you feel lonely. So, take advantage of his absence as much as possible, because you will not feel lonely except when he is with you. If you are put to trial with him, give him your outer attention, wander from him with your heart, separate your inner self from him, and do not let him distract you from what is more deserving of your attention. Know that the greatest of losses is for you to be preoccupied with one who will bring you nothing but a loss in your time with Allāh – the Mighty and Majestic – and being cut off from Him, wasting of your time on him, weakening of your energy, and dispersing of your attention. So, if you are tested with this – and you must be tested with this – deal with him according to how Allāh would wish, and be patient with him as much as possible. Get closer to Allāh and His Pleasure by way of this person, and make your getting together with him something to benefit from, not something to incur a loss from. Be with him as if you are a man who is on a road who was stopped by another man, who then asks you to take him on your journey. Make sure that you are the one who gives him a ride, and that he is not the one giving you the ride. If he refuses, and there is nothing to gain from traveling with him, do not stop for him, bid him farewell, and do not even turn back to look at him, as he is a highway robber regardless of who he really is. So, save your heart, be wary of how you spend your days and nights, and do not let the Sun set before you arrive at your destination“
“Guidance (hidaayah) is: [a] Elucidation (bayaan) and Indication (dalaalah) (to the path), then [b] Success (tawfeeq) and Inspiration (ilhaarn) (in following the path), and this comes after (the guidance of) elucidation and indication. There is no way to elucidation and indication except by means of the Messengers. So when elucidation, indication and acquaintance (of the path) has been obtained, there will occur, as a result of this the guidance of success (in following the path), the placing of faith (eemaan) in the heart and its beautification and endearment to it, making it (the heart) prefer eemaan, be pleased with it and aspire for it. There are two independent and distinct (types of) guidance. Success and prosperity cannot be gained except by them. They both contain the knowledge and acquaintance of that which we do not know of the truth, in both a general and specific sense, as well as our being inspired to the truth and being made to desire following it inwardly and outwardly. Then (they contain) the creation of the capability for us (by Allah) to perform the requirements of this guidance with respect to speech, action and firm resolution. (Then after all of this), being made to remain firm and established upon it until death. It is from the above that this extreme need of the servant for making this supplication is above every other need.“
Ibrahim ibn Adham was asked about the saying of Allah the Exalted, ‘And Your Lord said, Supplicate to me and I will answer your supplication.’ “We supplicate but our prayers are not answered!” He said, “Your hearts have become dead due to ten things – you have known Allah but have not fulfilled His right; you have read the Book of Allah but did not abide by it; you proclaimed enmity of Satan but made him your guardian and protector; you claimed love of the Messenger but you left his path and his Tradition (sunnah); you claimed love of Paradise but you did not work for it; you claimed fear of the Hellfire but did not renounce committing sins; you claimed that you believed that death was a reality but you did not ready yourselves for it; you busied yourselves with the faults of others and neglected your own faults; you eat from the sustenance that Allah provides for you but do not show gratitude; and you bury your dead ones but do not take heed from it.”