The phenomenon of weak faith has become very widespread among Muslims, and many people complain about the hardness of their hearts. So often we hear the words, “I feel hardness in my heart,” “I do not find any joy in worship,” “I feel that my faith has hit rock bottom,” “Reading Qur’aan does not move me,” “I fall into sin so easily.” The effects of this affliction can be seen in many people, and this problem is the cause of every disaster and adversity. The issue of people’s hearts is an important and sensitive issue. The heart is called qalb in Arabic because it changes so quickly and frequently (taqallub – alteration, variation, ups and downs). The Prophet (peace and blessings of Allaah be upon him) said: “The heart (qalb) takes its name from its constant changes (taqallub). The likeness of the heart is that of a feather at the root of a tree, being turned over and over by the wind.” (Reported by Ahmad, 4/408; Saheeh al-Jaami’, 2364). According to another report: “The likeness of the heart is that of a feather in an empty plot of land, being blown over and over by the wind.” (Reported by Ibn Abi ‘Aasim in Kitaab al-Sunnah. No. 227. Its isnaad is saheeh, see Zilaal al-Jannah fi Takhreej al – Sunnah by al-Albaani, 1/102).