Musar for Shabbat 65:1

Concerning solitude, the main thing is to remain at home. Even your visit to the synagogue should be very short. In fact, it is better to pray at home, for it is impossible to be spared from jealousy or from hearing idle talk or lashon hara in the synagogue. And one receives punishment for this, as we find (Shabbos 33a), "Also one who hears and is silent...." This is even the more so on Shabbos and Yom Tov when they gather to talk - It is then better that you don't pray at all. Refrain also from going to the cemetery (especially women), as it leads to all kinds of sorrow and sin. It is also advisable that your daughter not go to the synagogue, because she'll see beautiful clothes there, become jealous and talk about it at home. This will lead to lashon hara, etc. She should rather cling to Mussar and not become jealous of anything in this world, where everything is vanity and illusions, appearing and disappearing overnight (Yonah 4:10). "Though he grows as high as the sky, his head reaching the clouds, he perishes forever..." (Iyov 20:6,7). "For property does not last forever, or a crown for all generations" (Mishlei 27:24). And even while it exists it is worthless, loathsome and disdained by any sensible person. Woe to him who is impressed by it. Envy only the fear of Hashem (ib. 23:17). She should not say, "How can I earn a share in the World-to-Come? - I can't do it!" For we have learned (Berachos 17a): "One may do much or one may do little, provided he directs his heart to heaven."

They further said (Shabbat 33a): "Due to the sin of obscene speech, new troubles arise and the young men of Israel die" (Isaiah 9:16)

And regarding listening to obscenities it is likewise taught: "even one who listens and remains silent, as written '[The mouth of strange women is like a deep pit;] the one abhorred by G-d will fall therein'" (Shabbat 33a).

And now we shall speak about the faculty of hearing. Hearing, in itself, is good, as it is written (Isaiah 55:3): "Hear, and let your souls live." And (Mishlei 15:31): "The ear that hears the reproof of life, in the midst of the wise will it reside." And hearing works on a man to cause him to satisfy [an obligation] by hearing as if he had performed it himself. A proof may be adduced from the reading of the Megillah, the blowing of the shofar, and other such things, such as [the recitation of] Kiddush and the grace over meals, where one makes the blessing and all the listeners satisfy the obligation. Similarly, all of the receiving of the Torah was through hearing. All this, for good things. The reverse is true for bad things, G-d forbid. Hearing [bad things] also greatly affects a man's soul. It is well known what our sages of blessed memory have said (Kethuvoth 5b): "The Rabbis taught: 'Let a man not allow idle speech to be heard by his ears, for they are the first of the organs to be "burnt."'" How much more so [does this apply] to one who intends to cause rechiluth to be heard by his ears, this being proscribed by a negative commandment in the Torah, viz. (Shemoth 23:1): "You shall not bear a false report," or to one who hears, with intent, lashon hara and other forbidden things, or frivolous speech or leitzanuth (levity), in which instance his sin is too great to bear. And our sages of blessed memory have said about the scoffer (Avodah Zarah 18b) that suffering comes upon him, as it is written (Isaiah 28:22): "Do not scoff, lest your bonds be strengthened." And they have also said (Shabbath 33a): "Even he who listens [to obscenity] and remains silent [is condemned], it being written (Mishlei 22:14): 'The abhorred of the L-rd will abide there' [next to the speaker of obscenity.]"