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The Upanishads include sections on certain siddhantas that have been the very foundation of [[Sanatana Dharma (सनातनधर्मः)|Sanatana Dharma]]. For example, the Chandogya Upanishad includes one of the earliest known declaration of Ahimsa (non-violence) as an ethical precept. Discussion of other ethical premises such as Damah (temperance, self-restraint), Satya (truthfulness), Dāna (charity), Ārjava (non-hypocrisy), Daya (compassion) and others are found in the oldest Upanishads and many later Upanishads. Similarly, the Karma doctrine is presented in the Brihadaranyaka Upanishad, which is the oldest Upanishad.

The Upanishads include sections on certain siddhantas that have been the very foundation of [[Sanatana Dharma (सनातनधर्मः)|Sanatana Dharma]]. For example, the Chandogya Upanishad includes one of the earliest known declaration of Ahimsa (non-violence) as an ethical precept. Discussion of other ethical premises such as Damah (temperance, self-restraint), Satya (truthfulness), Dāna (charity), Ārjava (non-hypocrisy), Daya (compassion) and others are found in the oldest Upanishads and many later Upanishads. Similarly, the Karma doctrine is presented in the Brihadaranyaka Upanishad, which is the oldest Upanishad.

 

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'' satofthe Vedas now becomes the ekam eva advitiyam brahma'' or "the one and'' ''only and 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) with deities having a form and qualities called Saguna Brahman transformed to worship of "Tat" (That) without attributes, qualities, beyond name and form called as Nirguna Brahman. The qualities or the nature of Nirguna Brahma includes Infinite, Absolute, Eternal, Changeless, the All

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. Devatas are declared to be everywhere, as the innermost being of each human being and within every other living creature.  What was One reality or ''ekam'' sat'' of ''the Vedas becomesthe ekam eva advitiyam'' or "the one and'' only and sans a second" in the Upanishads. Brahman-Atman and Self-realization develops, in the Upanishad, as the means to moksha (liberation, freedom in this life or after-life).

'''Advaita : Brahman sans second'''

'''Advaita : Brahman sans second'''