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Know that not offering shukr for ni’mahs that are common to all, such as hearing and sight, that are constant and persist, such as light and fire, and that are encompassing and overflowing, such as air and water, is the greatest of the denial of ni’mah (kufr an-mi’mah) and the severest ingratitude towards the favours and kindness of Allah. But, man offers shukr to Allah for ni’mahs specified for him among people and replenished for him, or the rare ni’mahs given for his most rare needs; however, the permanent and constant ni’mahs that are common to all are the greatest and perfect ones. Their universality indicates their utmost importance and their constancy indicates their greater value.