The phenomenon of weakness of belief had been spread among Muslims. Many Muslims complain the hardness of their hearts and say: “I feel hardness in my heart,” “I do not feel the sweetness of performing the acts of worship,” “I feel that my belief had gotten down to the lowest level,” “I do not feel touched by the Holy Qur’an” or “I easily commit sins.” Moreover, the symptoms of this disease clearly appear on many people. Actually this disease is the origin of each disaster and the reason of all defaults and hardships. ... more