Musar su Deuteronomio 28:50

Cruelty is the opposite of Mercy as it is written: "They are cruel and have no compassion" (Jer. 50:42). And this trait of cruelty is not found in righteous people but in the souls of the wicked as it is written: "The tender mercies of the wicked are cruel" (Prov. 12:10). This quality is also found in the impudent as it is written: "An impudent nation that shall have no regard for the person of the old and show no mercy to the young" (Deut. 28:50). And you already know the evil of the trait of impudence. Go forth and learn the evil nature and the punishment of cruelty, for in the matter of the reward of a wicked man — rebellious and disobedient — it is said: "A rebellious man seeks only evil, therefore, a cruel messenger shall be sent against him" (Prov. 12:11). Every cruel person has no quality of kindness in his make up, even towards himself, as it is written: "The merciful man does kindness to his own soul, but he that is cruel troubles his own flesh" (Ibid. 11:17).

Sometimes satisfaction and cheerfulness follow upon hearing: thus it is said (Lev. x. 20), "When Moses heard that he was content," just as anger ensues in the absence of assent and hearkening, as (Ex. xvi. 20), "Notwithstanding, they hearkened not unto Moses." ..."And Moses was wroth with them." Hatred also results from hearing, as thou must know from the case of Esau, of whom it is said (Gen. xxvii. 34), "When Esau heard," and then follows (id. xxvii. 41), "Esau hated Jacob." Mercy is known to result from "hearing"; thus God said (Ex. xxii. 26), "I will hear, for I am merciful." It is said of the righteous dead (Prov. i. 33), "Whoso hearkeneth unto me shall dwell safely." In contrast to this, it is said of the unrighteous (Job xv. 21), "A sound of fright is in his ears: in peace the despoiler shall come upon him," and so forth. Hard-heartedness results from the want of assent; thus it is said of Pharaoh in many places (Ex. ix. 12), "The Lord hardened the heart of Pharaoh and he hearkened not." A hard-hearted people is called (Deut. xxviii. 49), "A nation whose tongue thou shalt not understand, neither shalt thou hearken unto what it speaketh," and so forth.