2. The Insult of Idolatry From: Hidden Secrets of the 10 Commandments
(ג) לֹֽ֣א יִהְיֶֽה־לְךָ֛֩ אֱלֹהִ֥֨ים אֲחֵרִ֖֜ים עַל־פָּנָֽ֗יַ (ד) לֹֽ֣א תַֽעֲשֶׂ֨ה־לְךָ֥֣ פֶ֣֙סֶל֙ ׀ וְכָל־תְּמוּנָ֡֔ה אֲשֶׁ֤֣ר בַּשָּׁמַ֣֙יִם֙ ׀ מִמַּ֡֔עַל וַֽאֲשֶׁ֥ר֩ בָּאָ֖֨רֶץ מִתַָּ֑֜חַת וַאֲשֶׁ֥֣ר בַּמַּ֖֣יִם ׀ מִתַּ֥֣חַת לָאָֽ֗רֶץ (ה) לֹֽא־תִשְׁתַּחְוֶ֥֣ה לָהֶ֖ם֮ וְלֹ֣א תָעָבְדֵ֑ם֒ כִּ֣י אָֽנֹכִ֞י יְהוָ֤ה אֱלֹהֶ֙יךָ֙ אֵ֣ל קַנָּ֔א פֹּ֠קֵד עֲוֺ֨ן אָבֹ֧ת עַל־בָּנִ֛ים עַל־שִׁלֵּשִׁ֥ים וְעַל־רִבֵּעִ֖ים לְשֹׂנְאָֽ֑י׃ (ו) וְעֹ֥֤שֶׂה חֶ֖֙סֶד֙ לַאֲלָפִ֑֔ים לְאֹהֲבַ֖י וּלְשֹׁמְרֵ֥י מִצְוֺתָֽי׃ (ס)
(3) You shall have no other gods besides Me. (4) You shall not make for yourself a sculptured image, or any likeness of what is in the heavens above, or on the earth below, or in the waters under the earth. (5) You shall not bow down to them or serve them. For I the LORD your God am an impassioned God, visiting the guilt of the parents upon the children, upon the third and upon the fourth generations of those who reject Me, (6) but showing kindness to the thousandth generation of those who love Me and keep My commandments.

Rabbi Arthur Waskow, "Israel, Hillel, and Idolatry," TheShalomCenter.org, 12/16/13

What is idolatry? Worshipping any being – person, object, institution, community – as if it were Divine. “Carving it out” and “bowing down to it” as the Ten Commandments describe and forbid. (Exod. 20: 4). Not only “carving out” a physical object, a statue, but carving out from the One Great Flow of Life a piece that must not be criticized, not be questioned. A piece not only to be loved and honored for its usefulness and beauty, not only to be seen as a temporary aspect in service to that Unity — but treated as an Ultimate, Unchangeable good.

Rabbi Harold Schulweis

“The objects of idolatrous adorations, the Rabbis warned, were not in themselves evil. Stars, moon, trees, sun are not unholy. It is the worship of portions of creation as if they were the whole of creation that eclipses the unity of God’s world and profanes it. When institutions or ideologies arrogate to themselves exclusive truth and dismiss all others as aberrations, the plentitude and grandeur of Judaism are impoverished.
(Moment magazine, September, 1985)

Rabbi Louis Jacobs, The Jewish Religion: A Companion, published by Oxford University Press.

The Hasidic master, Shneur Zalman of Liady [1745-1813] sees idolatry not as a denial of God but as an attempt at insubordination. Man desires to have a little corner of life apart from God’s all‑embracing power, and the idols he sets up are his means of effecting the separation between God and that part of life man wishes to call completely his own. Hence, for the Rabbis, pride is equivalent to idolatry because both commit the same offence of insubordination.

“Pride is truly equivalent to idolatry. For the main root principle of idolatry consists in man’s acknowledgement of something existing in its own right apart and separate from God’s holiness, and does not involve a complete denial of God” (Tanya, chapter 22).