Satcitananda

Satcitananda (Sanskrit: सच्चिदानंद, IAST: Saccidānanda, also Sat-cit-ananda or Sacchidānanda) is an epithet and description for the subjective experience of the ultimate unchanging reality, called Brahman, in certain branches of Hindu philosophy, especially Vedanta. It represents "existence, consciousness, and bliss" or "truth, consciousness, bliss".
Etymology.
"Satchitananda" (Sanskrit: सच्चिदानन्द) is a compounded Sanskrit word consisting of "sat", "chit" and "ananda", all three considered as inseparable from the nature of ultimate reality called Brahman in Hinduism. The different forms of spelling is driven by euphonic (sandhi) rules of Sanskrit, useful in different contexts.
"Satchitananda" is therefore translated as "Truth Consciousness Bliss", "Reality Consciousness Bliss", or "Existence Consciousness Bliss".
Discussion.
The term is contextually related to "the ultimate reality" in various schools of Hindu traditions. In theistic traditions, "sacchidananda" is same as God such as Vishnu, Shiva or Goddess in Shakti traditions. In monist traditions, "sacchidananda" is considered directly inseparable from "nirguna" (attributeless) Brahman or the "universal wholeness of existence", wherein the Brahman is identical with Atman, the true individual self. "Satchitananda" or Brahman is held to be the source of all reality, source of all conscious thought, and source of all perfection-bliss. It is the ultimate, the complete, the destination of spiritual pursuit in Hinduism.
Textual references.
The Brihadaranyaka Upanishad ( 800–600 BCE) is among the earliest Hindu texts which links and then discusses Atman (soul), Brahman (ultimate reality), awareness, joy and bliss such as in sections 2.4, 3.9 and 4.3. The Chandogya Upanishad (~800-600 BCE), in section 3.14 to 3.18, discusses Atman and Brahman, these being identical to "that which shines and glows both inside and outside", "dear", "pure knowing, awareness", "one's innermost being", "highest light", "luminous". Other 1st-millennium BCE texts, such as the Taittiriya Upanishad in section 2.1, as well as minor Upanishads, discuss Atman and Brahman in saccidananda-related terminology.
An early mention of the compound word "sacchidananda" is in verse 3.11 of Tejobindu Upanishad, composed before the 4th-century CE. The context of "sacchidananda" is explained in the Upanishad as follows:
Vedanta philosophy.
The Vedantic philosophy understands "saccidānanda" as a synonym of the three fundamental attributes of Brahman. In Advaita Vedanta, states Werner, it is the sublimely blissful experience of the boundless, pure consciousness and represents the unity of spiritual essence of ultimate reality.
Saccidānanda is an epithet for Brahman, considered indescribable, unitary, ultimate, unchanging reality in Hinduism., 
Vaishnava philosophy.
Tulsidas considers Rama as "Satcitananda".