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The idol is the expression of religion.

Swami Vivekananda (1926). “The Complete Works of the Swami Vivekananda, Comprising All His Lectures, Addresses and Discourses Delivered in Europe, America and India: All His Writings in Prose and Poetry, Together with Translations of Those Written in Bengali and Sanskrit; Reports of His Interviews and His Replies to the Various Addresses of Welcome; His Sayings and Epistles,--private and Public--original and Translated; with an Index; Carefully Revised & Edited”
The idol is the expression of religion.