Imam 'Ali once said, "Kalbu have wanted a state, facing and mengungkur. So, Go to heart when he was in a state of want and face. Therefore, when the heart was not wanted, then he became blind."
Allah says : "Are there any of you recognize and take my promise that! 'They said,' We admit it. 'Said God,' bear witness! For I am with you would be a witness. ' "(Surah Ali' Imran, 3:81).