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===एकं सत् ॥ The One Existence===

===एकं सत् ॥ The One Existence===

Worship of the nature and devatas such as the ''Agni'', ''Aditya'', ''Indra'', ''Rudra'', ''Visnu'', ''Brahma'' and others becomes internalized in the Upanishads to the meditation on the supreme, immortal and formless Brahman-Atman. The many names of devatas with forms and weapons gradually merged into defining a One Existence, a supreme being called now as Paramatma, Brahman etc.<blockquote>एकं सद्विप्रा बहुधा वदन्ति (Rig. Veda. 1.164.46)</blockquote>Devatas who held positions in the outer worlds are now declared to be everywhere, even as the innermost being of each human being and within every other living creature.<blockquote>एकमेवाद्वितीयम्। (Chand. Upan. 6.2.1)<ref>Chandogya Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%9B%E0%A4%BE%E0%A4%A8%E0%A5%8D%E0%A4%A6%E0%A5%8B%E0%A4%97%E0%A5%8D%E0%A4%AF%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83_%E0%A5%AC Adhyaya 6])</ref></blockquote>What was One reality or ''ekam'' sat of the Vedas now transformed to the ekam eva advitiyam brahma'' or "the one and'' ''only one, sans a second''" in the Upanishads. Discussion of Brahman-Atman and Self-realization develops in the Upanishads as the means to moksha (liberation, freedom in this life or after-life). Worship which was primarily of the nature and natural elements (like fire, clouds and rains, air) was followed by deities having a form and qualities called Saguna Brahman which gradually led to worship of "Tat" (That) a nameless, formless Supreme Entity without attributes and qualities called as Nirguna Brahman.  

Worship of the nature and devatas such as the ''Agni'', ''Aditya'', ''Indra'', ''Rudra'', ''Visnu'', ''Brahma'' and others becomes internalized in the Upanishads to the meditation on the supreme, immortal and formless Brahman-Atman. The many names of devatas with forms and weapons gradually merged into defining a One Existence, a supreme being called now as Paramatma, Brahman etc.<blockquote>एकं सद्विप्रा बहुधा वदन्ति (Rig. Veda. 1.164.46)</blockquote>Devatas who held positions in the outer worlds are now declared to be everywhere, even as the innermost being of each human being and within every other living creature.<blockquote>एकमेवाद्वितीयम्। (Chand. Upan. 6.2.1)<ref>Chandogya Upanishad ([https://sa.wikisource.org/wiki/%E0%A4%9B%E0%A4%BE%E0%A4%A8%E0%A5%8D%E0%A4%A6%E0%A5%8B%E0%A4%97%E0%A5%8D%E0%A4%AF%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A5%8D/%E0%A4%85%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83_%E0%A5%AC Adhyaya 6])</ref></blockquote>What was One reality or ''ekam'' sat of the Vedas now transformed to the ekam eva advitiyam brahma'' or "the one and'' ''only one, sans a second''" in the Upanishads. Discussion of Brahman-Atman and Self-realization develops in the Upanishads as the means to moksha (liberation, freedom in this life or after-life). Worship which was primarily of the nature and natural elements (like fire, clouds and rains, air) was followed by deities having a form and qualities called Saguna Brahman which gradually led to worship of "Tat" (That) a nameless, formless Supreme Entity without attributes and qualities called as Nirguna Brahman.