Musar su Geremia 12:8

And consider how great is the sin of a man who speaks evil speech: Is their sin that they have sealed their lips and quieted their tongues from speaking words of Torah not big enough for them; that they surely [use them to] destroy with evil speech? And King David, peace be upon him, said (Psalms 119:23), “Though princes meet and speak against me, Your servant speaks out Your laws.” The explanation is that they are still from speaking out Your laws and speak evil speech and speak against me, while I am still speaking out Your laws. And our Rabbis said (Arakhin 15a) [that] the cure for evil speech - to save oneself from it - is to be involved with the Torah; as its stated (Proverbs 15:4), “A healing tongue is a tree of life,“ And this is [the meaning of] what is stated (Psalms 39:2), “I would keep my mouth muzzled, etc.” And our Rabbis, may their memory be blessed, explained (Midrash Tehillim 39) that the muzzle is involvement with Torah. And our Rabbis said (Yalkut Shimoni on Nach 721), “The Congregation of Israel is beloved by her voice and hated by her voice: She is beloved by her voice, as it is stated (Song of Songs 2:14), ‘let me hear your voice; for your voice is sweet.’ And she is hated by her voice, as it is stated (Jeremiah 12:8), ‘she raised her voice against Me; therefore I have hated her.’” And this is [the meaning of] what is stated (Proverbs 18:21), “Death and life are in the power of the tongue; those who love it will eat its fruit.” And its explanation is: “Those who love it will eat its fruit” - and one who loves the tongue, and that is a man that always wants to talk, for him the proper counsel is that he should, “eat its fruit.” That is, he should not speak idle words but rather words of Torah, wisdom and ethics and the bringing of peace between a man and his fellow; justify the [actions of] the masses; praise the good; disparage the evil; and be zealous about the truth. For there is no end to the merits that he can acquire for himself with his tongue. And [it is] as we discussed earlier, that life is in the tongue.

As to that which our Sages said, that "One sin quenches a commandment, but one sin does not quench the whole Torah" (Sotah 21a), as it is said, "For the commandment is a lamp, and the teaching is a light" (Prov. 6:23) — this applies to one who commits a sin by chance, but not to one who completely throws off the yoke of warning against a sin. And our Sages, of blessed memory, said, "The congregation of Israel is beloved for its voice" (Shohar Tov, 39a), as it is said, "Let me hear thy voice; for sweet is thy voice" (Cant. 2:14). And it is also hated for its voice, as it is said, "She hath uttered her voice against Me, therefore have I hated her" (Jer. 12:8). From this we can conclude that "life and death are in the power of the tongue" (Prov. 18:21). And it is said, "And those who love her will eat her fruit" (ibid.). This means that one who loves the tongue, that is to say a man who loves to speak constantly, it is worthy and true counsel to him that he should eat of its fruit. In other words, he should not speak idle talk, but should speak words of the Torah, or words that will bring peace, or words that will teach many to do good, and he should teach them the good and keep them far from evil, and to be zealous for the truth, for there is no end to the good deeds that a man may do with his tongue. And this is the meaning of "life and death are in the power of the tongue."