Thanks to Niveditaji for alternative expressions with the word siva for rudra for the oft quoted nArudrO rudramarchayEt .
But these expressions need not necessarily be taken to Advaita Vedanta.
They might have to do with the ritual requirement of an 'elevated' level of 'consciousness' for the operation of the supernatural. Otherwise the verb archayEt and the conditionality in the sentence can not be explained.
Also, nArudrO rudramarchayEt is seen expressed in revert ways in early "Saiva canons and in later paddhati literature, for example: in Ni"svaasa uttarasuutra, 2.8.: "śivībhutaḥ
prasannātmā śivasyārcanamācaret"; in Sarvajñānottara tantra, 5.2. "śivībhūtah
supūtātmā śivasyārcanamārabhet" and in many "Saiva Paddhati literature -"śivo
bhūtvā śivaṃ yajet". Morever, it is a Vedantic concept of identifying oneself with Brahman (aham brahmosmi, so aham), and implemented in "Saiva philosophy as well in "Saiva rituals and worship as Prof. Nagaraj Paturi mentions.
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Prof.Nagaraj Paturi
Hyderabad-500044