Musar su Isaia 6:7

Thus when the penitent man recognizes his sin and admits it, and reflects on his evil, repents of it and completely regrets ever having done it, as he would regret [in annulling] a certain vow, in which case there is complete regret, and he desires and longs that this deed had never been committed, and pains himself strongly that the matter was done, and renounces it for the future, and flees from it - then the uprooting of the deed from his will is counted to him as the annulment of a vow and he gains atonement for it. As scripture says: "your iniquity is gone and your sin atoned for" (Isaiah 6:7) - that the sin is actually removed from existence, and uprooted through his paining himself and regretting in the present what he had done in the past.

The second detrimental factor, laughter and levity, is very severe. For one who is immersed in these is like one immersed in the great sea, from which it is extremely difficult to escape. For behold, laughter destroys a man's heart until reason and knowledge no longer rule in him. He becomes like a drunkard or a madman whereby it is impossible to give counsel or guide them for they are incapable of accepting any direction.

Behold, the prophet Isaiah would "scream like a crane" for he saw that this was what left no room for his rebukes to make an impression thus ruining all hope for the sinners. This is what he said: "And now do not be mockers lest your afflictions be strengthened" (Isaiah 28:22).

In the preceding chapters we spoke about the individual. How much more so must one take great heed not to impute liability to Israel in general, for this sin is very severe. As we find in Pesachim 87b on Proverbs 30:10 "'Speak not ill of a servant to his master… a generation that curses its father and does not bless its mother.' …Even a generation that curses its father and does not bless its mother — do not speak ill of it to its Master — the Holy One Blessed be He." And see now [the instance of] Isaiah the prophet. When he saw the glory of the L-rd and said (Isaiah 6:5): "Woe unto me, for I am lost, for I am a man of unclean lips; and in the midst of a people of unclean lips do I dwell, etc." — because he said "and in the midst of a people of unclean lips," even though his intent in this was not to shame Israel, (for he said this also of himself) but only to say that he was not worthy of seeing the Shechinah, neither in point of his deeds nor of those of the people in whose midst he dwelt — in spite of this, see what follows (Ibid. 6): "Then one of the seraphs flew unto me [Isaiah] and in his hand was a live coal [ritzpah]," concerning which Chazal say that "ritzpah" is acronymic of "retzoth peh" ["crush the mouth"] that slanders My children." And he died as a result of this, as they say in Yevamoth 49b: "[He (Isaiah) uttered the Name and was 'swallowed up' in a cedar.] the cedar was brought and sawed. When it [the saw] came to his mouth, he died, [this, for having said 'And in the midst of a people of unclean lips do I dwell.']"