Rabbi Shimon bar Elazar teaches that one who tears his garments, breaks his utensils, or scatters his money in anger is like one who serves idols — for that is how the evil inclination works, acting today and tomorrow until it leads a person to full idolatry.
אֵימַר דְּשָׁמְעַתְּ לֵיהּ לְרַבִּי יְהוּדָה בִּמְתַקֵּן, בִּמְקַלְקֵל מִי שָׁמְעַתְּ לֵיהּ? אָמַר רַבִּי אָבִין: הַאי נָמֵי מְתַקַּן הוּא, דְּקָעָבֵיד נַחַת רוּחַ לְיִצְרוֹ. וּכְהַאי גַּוְונָא מִי שְׁרֵי? וְהָתַנְיָא, רַבִּי שִׁמְעוֹן בֶּן אֶלְעָזָר אוֹמֵר מִשּׁוּם חִילְפָא בַּר אַגְרָא שֶׁאָמַר מִשּׁוּם רַבִּי יוֹחָנָן בֶּן נוּרִי: הַמְקָרֵע בְּגָדָיו בַּחֲמָתוֹ, וְהַמְשַׁבֵּר כֵּלָיו בַּחֲמָתוֹ, וְהַמְפַזֵּר מְעוֹתָיו בַּחֲמָתוֹ, יְהֵא בְּעֵינֶיךָ כְּעוֹבֵד עֲבוֹדָה זָרָה. שֶׁכָּךְ אוּמָּנוּתוֹ שֶׁל יֵצֶר הָרָע: הַיּוֹם אוֹמֵר לוֹ עֲשֵׂה כָּךְ, וּלְמָחָר אוֹמֵר לוֹ עֲשֵׂה כָּךְ, עַד שֶׁאוֹמֵר לוֹ עֲבוֹד עֲבוֹדָה זָרָה וְהוֹלֵךְ וְעוֹבֵד. אָמַר רַבִּי אָבִין: מַאי קְרָאָה — ״לֹא יִהְיֶה בְךָ אֵל זָר וְלֹא תִשְׁתַּחֲוֶה לְאֵל נֵכָר״, אֵיזֶהוּ אֵל זָר שֶׁיֵּשׁ בְּגוּפוֹ שֶׁל אָדָם? הֱוֵי אוֹמֵר, זֶה יֵצֶר הָרָע.
The Gemara asks: Say that you heard that Rabbi Yehuda rules that one is liable for performing a labor not needed for its own sake in the case of a constructive act; did you hear him deem one liable in the case of a destructive act? Rabbi Avin said: This case, where one rends his garment in anger, is also constructive, because in doing so he assuages his anger. Rending his garment calms him; therefore, it can be said that he derives benefit from the act of rending, and it is consequently a constructive act. The Gemara asks: And is it at all permitted to tear in that manner? Wasn’t it taught in a baraita that Rabbi Shimon ben Elazar says in the name of Ḥilfa bar Agra, who said in the name of Rabbi Yoḥanan ben Nuri: One who rends his garments in his anger, or who breaks his vessels in his anger, or who scatters his money in his anger, should be like an idol worshipper in your eyes, as that is the craft of the evil inclination. Today it tells him do this, and tomorrow it tells him do that, until eventually, when he no longer controls himself, it tells him worship idols and he goes and worships idols. Rabbi Avin said: What verse alludes to this? “There shall not be a strange god within you, and you shall not bow to a foreign god” (Psalms 81:10). What is the strange god that is within a person’s body? Say that it is the evil inclination. One may not rend his garments in anger, because in doing so he is deriving pleasure from satisfying the evil inclination.