“Indeed, faithful is the one who - when pleased and glad, his pleasure does not make him enter into sin and falsehood; and when unhappy and angry, his anger does not oust him from the world of righteousness; and when he gains power, his power does not make him commit excess, nor opression, nor make him go for a thing upon which he does not have any right.”
Muhammad Kulayni, Usūl al-Kāfī, vol.2, p. 234
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Muhammad al-Baqir 30
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