|| Aum Sat Chit Ananda Parabrahma
Sri Bhagavati Sametha
Sri Bhagavate Namaha ||
What's the source of this Mantra?
Yoga Vasistha speaks about the bhutākāsha – dealing with gross matter, chittākāsha – dealing with mental concepts and chidākāsha with the ātman . These are spaces projected by the mind but all spaces are reduced to one, that is, to the ultimate space which is one’s own true self. Chittākāsha is the field of the mind which provokes a deeper enquiry because there is in it still the duality of the 'seer' (drg) and the 'seen' (drshya); this duality ceases to exist in chidākāsha which is the field of Pure Consciousness viewed by the mind non-casually. Different mental spaces are seen when the mind ventures outwards to see all that which exists externally, but what already exists externally exists within contained in the inner mental space whose nature is different in different planes, and because consciousness functions variously in varying dimensions depending upon fineness of matter, the number of dimensions and the varying subtlety of the mind. Chidākāsha is the result of Divine Ideation which makes the world a mental projection that functions within time and space to give itself a semblance of reality
Aatmastakam - Chidananda Roopah Shivoham Shivoham
Mano Budhyahankaar Chitani Naaham, Na Cha Shrotra Jihve Na Cha Ghraana netre Na Cha Vyoma Bhumir Na Tejo Na Vayuh, Chidananda Rupah Shivoham Shivoham
Na Cha Praana Sanjno Na Vai Pancha Vaayuhu, Na Vaa Sapta Dhaatur Na Va Pancha Koshah Na Vaak Paani Paadau Na Chopasthapaayuh, Chidaananda Rupah Shivoham Shivoham
I am not mind, nor intellect, nor ego, nor the reflections of inner self (chitta). [more] I am not the five senses.I am beyond that. I am not the ether, nor the earth, nor the fire, nor the wind.I am indeed, That eternal knowing and bliss, Shiva, love and pure consciousness.
Chida(consciousness) is translated wrong by people as Chita(which is individual's) https://en.wikipedia.org/wiki/Chidakasha
and Hence it is "Sat Chida Ananda"