Musar su Salmi 39:3

This enables us to understand (Berachoth 5a): "If it is possible for one to study Torah and does not do so, the Holy One Blessed be He brings upon him sore afflictions which sully him, as it is written (Psalms 39:3): "I was dumb with silence, silenced from good [i.e., Torah] and my pain [i.e., my afflictions] sullied me." This is measure for measure. Because he shamed the Torah and made it like an unwanted vessel, he, too, was shamed before all.

"It is written: 'He who guards his mouth and his tongue guards his soul from troubles.'" For if his lips and his tongue speak evil things, these words rise above. And when they rise, all proclaim: "Remove yourselves from the vicinity of the lashon hara of Ploni. Make way for the coming of the mighty Serpent!" And then his holy soul flies far away from him and cannot speak, as it is written (Psalms 39:3): "I was dumb in deep silence. I was stilled from good." And this soul rises in shame and great suffering and is not given a place as before. And of this it is written: "He who guards his mouth and his tongue guards his soul from troubles." This is its language in short.

All this is alluded to in Psalms 39,3: נאלמתי דומיה, החשתי מטוב וכאבי נעכר. "I was dumb, silent; I was very still while my pain was intense." The word דום-י-ה must be broken up so that we see that G–d decreed dumbness on the speaker in the verse. Being "silent from טוב," is an allusion to not having Torah inspiration; the only true טוב is Torah. The end of the verse describes Moses' reaction to this diminution of his intellectual/spiritual powers. According to סדר הדורות, at the beginning of his career Moses' name was שממה; it subsequently became משה. This is what is meant by Isaiah 52,13: "Indeed My servant shall prosper," meaning that Moses will be the משיח, the numerical value of the letters משה=345 being equal to the numerical value of the letters in the name שילה (a reference to Genesis 49, 10 where the word is understood to refer to the Messiah). Our sages in Bamidbar Rabbah 11,3 comment on the above that the first Redeemer will have the same name as the Ultimate Redeemer. The Ultimate Redeemer will be revealed to them only to be subsequently hidden from them, just as was the case with the first Redeemer. This is supposedly also alluded to in Kohelet 1,4: "A generation goes and a generation comes."