לֹֽא־יַחְפֹּ֣ץ כְּ֭סִיל בִּתְבוּנָ֑ה כִּ֝֗י אִֽם־בְּהִתְגַּלּ֥וֹת לִבּֽוֹ׃
미련한 자는 명철을 기뻐하지 아니하고 자기의 의사를 드러내기만 기뻐하느니라
Akeidat Yitzchak
From the above it is dear that when man abuses this power of speech, he denies his superiority over the beasts and calls into question the value of his whole existence. It is like a king who presented his servant with a fancy garment, only to have the servant drape it over his donkey. The sages of Israel are complimented when the Talmud Sukkah 28, states that they never indulged in idle talk. Maimonides divides speech into five categories. 1) Obligatory speech, i.e. teaching Torah. 2) Speech which must be avoided; false testimony, slander etc. 3) Disgraceful speech; i.e. what we call idle talk. 4) Desirable speech, i.e. words of mussar, moral instruction, sermons etc. 5) Permissible speech, i.e. speech needed in the pursuit of earning one's livelihood. In view of the above, we can understand Rabbi Shimon ben Gamliel who said that he found silence to be the essence of all wisdom, the best remedy for maintaining one's body's good health. (Avot 1,17) By moving in the company of sages, he learned that more even than the words of wisdom he learned, he learned to appreciate the importance of minimising talk. Silence is the seyag, the protective fence built around wisdom. It ensures that the latter remains untainted. Even a fool may be considered wise, as long as he keeps his mouth shut. We are taught in Pessachim 3, that one should employ few words when teaching one's students. The Mishnah in Avot tells us that "not the exposition is of crucial importance, but the execution, the deed." An alternate meaning of Rabbi Shimon ben Gamliel's statement might be this: "I have not found that sitting silently, without asking for clarification, contributes to the essence, namely the learning process. However, excessive talk is harmful."
Duties of the Heart
Of the lowest degree are those who are misled by foolishness and the overwhelming force of evil passions to reject the Torah which they consider to be similar to the laws by which other peoples are guided and the simple kept in check. This attitude results from the powerful hold that sensual lust has obtained over their understanding, and from their gross nature; they do not submit to the yoke of the Torah, nor will they be bound by the restraints of reason, due to their longing for unrestrained license. Of people of this sort the sage says, "A fool has no delight in understanding but only that his heart may discover itself (follow its impulses)" (Mishlei 18:2).