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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>एकमेवाद्वितीयं ब्रह्म (Chand. Upan. 6.2.1)</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.  

===Nirguna Brahma Swaroopa===

===Nirguna Brahma Swaroopa===

Brahman is the material, efficient, formal and final cause of all that exists. It is the pervasive, genderless, infinite, eternal truth and bliss which does not change, yet is the cause of all changes. Brahman is "the infinite source, fabric, core and destiny of all existence, both manifested and unmanifested, the formless infinite substratum and from which the universe has grown". Kathopanishad states 1.2.15 and 16 that<blockquote>सर्वे वेदा यत्पदमामनन्ति तपाँसि सर्वाणि च यद्वदन्ति । यदिच्छन्तो ब्रह्मचर्यं चरन्ति तत्ते पदँ संग्रहेण ब्रवीम्योमित्येतत् ॥ १५ ॥</blockquote><blockquote>एतद्ध्येवाक्षरं ब्रह्म एतद्ध्येवाक्षरं परम् । एतद्ध्येवाक्षरं ज्ञात्वा यो यदिच्छति तस्य तत् ॥ १६ ॥ (Kath. Upan. 1.2.15)<ref>Kathopanishad ([https://sa.wikisource.org/wiki/%E0%A4%95%E0%A4%A0%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A4%A4%E0%A5%8D/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A5%8B%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83/%E0%A4%A6%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%A4%E0%A5%80%E0%A4%AF%E0%A4%B5%E0%A4%B2%E0%A5%8D%E0%A4%B2%E0%A5%80 Adhyaya 1 Valli 2])</ref></blockquote>That which all the Vedas declare, that which all austerities utter, That desiring which they lead the life of Brahmacharya, That Word I tell thee briefly : it is Aum. That word is even Brahman; that Word is even the Supreme. <ref name=":022">''Sanatana Dharma : An Advanced Textbook of Hindu Religion and Ethics''. (1903) Benares : The Board of Trustees, Central Hindu College</ref>

Brahman is the material, efficient, formal and final cause of all that exists. It is the pervasive, genderless, infinite, eternal truth and bliss which does not change, yet is the cause of all changes. Brahman is "the infinite source, fabric, core and destiny of all existence, both manifested and unmanifested, the formless infinite substratum and from which the universe has grown". Kathopanishad states 1.2.15 and 16 that<blockquote>सर्वे वेदा यत्पदमामनन्ति तपाँसि सर्वाणि च यद्वदन्ति । यदिच्छन्तो ब्रह्मचर्यं चरन्ति तत्ते पदँ संग्रहेण ब्रवीम्योमित्येतत् ॥ १५ ॥</blockquote><blockquote>एतद्ध्येवाक्षरं ब्रह्म एतद्ध्येवाक्षरं परम् । एतद्ध्येवाक्षरं ज्ञात्वा यो यदिच्छति तस्य तत् ॥ १६ ॥ (Kath. Upan. 1.2.15)<ref>Kathopanishad ([https://sa.wikisource.org/wiki/%E0%A4%95%E0%A4%A0%E0%A5%8B%E0%A4%AA%E0%A4%A8%E0%A4%BF%E0%A4%B7%E0%A4%A6%E0%A4%A4%E0%A5%8D/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A5%E0%A4%AE%E0%A5%8B%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83/%E0%A4%A6%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%A4%E0%A5%80%E0%A4%AF%E0%A4%B5%E0%A4%B2%E0%A5%8D%E0%A4%B2%E0%A5%80 Adhyaya 1 Valli 2])</ref></blockquote>That which all the Vedas declare, that which all austerities utter, That desiring which they lead the life of Brahmacharya, That Word I tell thee briefly : it is Aum. That word is even Brahman; that Word is even the Supreme. <ref name=":022">''Sanatana Dharma : An Advanced Textbook of Hindu Religion and Ethics''. (1903) Benares : The Board of Trustees, Central Hindu College</ref>