The khushû', that is to say the concentration in the prayer, is located in the heart and its effects appear on the physical body. The various faculties follow the heart: if the heart is corrupted by negligence or by the murmurings of Satan, the acts of worship of the body will also be corrupted. Indeed, the heart is like a king whose soldiers are the body and the members who follow his orders and who do what they are ordered. If the king is fallen, his subjects go astray, and that's what happens when the heart doesn't worship properly.

Readers will discover in this book 33 practical and spiritual advice from the Koran and the Sunna, as well as numerous invocations reported from the Messenger of Allah (sa) to find in prayer a source of consolation and contemplation. The khushû' decreases and increases, the higher its level and the closer is the believer to his Lord.