Musar su Proverbi 20:14

I reiterate my request that you guide your sons and daughters with words of kindness and Mussar that will find a place in their heart. This is true especially if we merit to arrive in Eretz Yisrael, because one must be extra cautious to follow Hashem's ways there. Therefore, train them well, since one must work hard on one's speech and character traits, and only through good habits can we control ourselves (Shaarey Teshuvah). All beginnings are hard (Mechilta Yisro). But afterwards, one is worthy of praise (Mishlei 20:14). For the wicked person knows that he is taking the wrong path, but it is hard for him to change. But this is man's main task, not to go after his desires, but (Tehillim 32:9) "to restrain himself with a bit and bridle when he is being groomed." Man must deprive himself until he dies, not by fasting or asceticism, but by controlling his mouth and desires. This is teshuvah. And this is the whole reward of the World-to-Come, as it is written (Mishlei 6:23): "For the commandment is a lamp and the Torah is a light" - but "the way to life is the rebuke that disciplines." And that is worth more than any amount of fasting and self-affliction! For every second that man controls his tongue, he merits some of the "hidden [by Hashem for the righteous] light," something which no angel or [other] creature can imagine (Midrash). And it is stated (Tehillim 34:13,14): "Who is the man who desires life, and loves days that he may see good? Guard your tongue from evil, and your lips from speaking deceitfully." This will atone for any sin and save one from Gehinnom, as we find (Mishlei 21:23): "He who guards his mouth [from too much eating and drinking] and tongue [from idle words] guards himself from trouble." Also (ib. 18:21): "Death and life are in the power of the tongue." Woe to one who gives away his life for one word! Then what advantage is there to one who has a tongue (see Koheles 10:11)? And, "Everything has a cure except, etc." It is most important to refrain from speaking words of praise about anyone. How much more so does this apply to speaking ill of anyone! Why must one speak about others? "The mouth that speaks strangely is a deep pit; he who angers Hashem falls into it" (Mishlei 22:14).