Spiritual Education and Purification of Souls, a book with excerpts from famous authors Hassan Al Basri, Al Ghazali Ibn Al Qayyim published by Iqra Editions.

Spiritual Education and Purification of Souls - IQRA Edition

On that day [the resurrection], neither wealth nor offspring will be useful, only he who comes to God with a pure (holy) heart will be saved… Koran. .. The heart can be reached, and its evil worsen without one realizing it. He can even die without anyone knowing it. A sick heart consists in its bearer not reacting to the wounds of disobedience and not feeling the devastating effect of his ignorance of the truth. Because when the heart is alive, it feels the pain caused by the nuisances which reach it and by the ignorance of the truth according to the degree of its vitality. He can then feel the pain but cannot bear the bitterness of the remedy.

This is why he prefers the persistence of pain to the discomfort caused by taking the remedy… The progress of the faithful towards the proximity of God is proportional to the efforts of this one to purify his heart and give him life, his soul thus frees itself from passions, pure it rises from one spiritual station to another and flies away towards its eternal happiness in the proximity of God. This book, drawing on various great traditional texts, can be an introduction to the novice towards certain fundamental elements of the spiritual life in Islam.