Imam Ja‘far al-Ṣadiq (as): A believer should possess eight qualities: He should be composed and dignified in tribulations, patient in the face of calamities, thankful in times of comfort, and content with whatever sustenance Allah has provided for him. He does not do injustice to his enemies. He does not place his burden on his friends. His own self is exhausted because of him, whereas people are at ease when being with him. Knowledge is the friend of the believer, forbearance is his minister, intellect is the commander of his army, lenience is his brother and righteousness is his father. al-Kāfī