The Atmashaktam Mantra

The Atmashatkam (आत्मषट्कम्, ātmaṣaṭkam), also known as Nirvanashatkam (निर्वाणषट्कम्, Nirvāṇaṣaṭkam) is a composition consisting of 6 fold śloka (and hence the name Ṣaṭ-ka to mean six-fold) written by the Hindu philosopher Adi Shankara summarizing the basic teachings of Advaita Vedanta, or the Hindu teachings of non-dualism. It was written around 788-820 CE.

The speaker of the poem is nominally the god Shiva, but it is generally seen as a statement by a knowing person of identity with Shiva or Brahman. The speaker lists in the earlier verses what he (or Brahman) is not. He is not body or mind, nor the things that attach them to each other and to the world, including the intellect, the senses, the practices of life, the occurrences of life such as birth and death. In the last verse he says that he permeates the universe, and that he is consciousness, bliss and the soul, and by implication, the Atman and Brahman.

It is said that that when Ādi Śaṅkara was a young boy of eight and wandering near River Narmada, seeking to find his guru, he encountered the seer Gaudapada who asked him, "Who are you?". The boy answered with these stanzas, which are known as "Nirvāṇa Ṣaṭkam" or Ātma Ṣaṭkam".

Gaudapada accepted Ādi Śaṅkara as his disciple. The verses are said to be valued to progress in contemplation practices that lead to Self-Realization.

"Nirvāṇa" is complete equanimity, peace, tranquility, freedom and joy. "Ātma" is the True Self.
"Sivam" The Supreme Absolute, Lord, Shiva.

mano buddhi ahankara chittani naaham na cha shrotravjihve na cha ghraana netre na cha vyoma bhumir na tejo na vaayuhu chidananda rupah shivoʼham shivoʼham

I am not the mind, the intellect, the ego or the memory, 

I am not the ears, the skin, the nose or the eyes,
I am not space, not earth, not fire, water or wind,
I am the expression of consciousness and bliss,
I am the eternal Shiva...

na cha prana sangyo na vai pancha vayuhu na va sapta dhatur na va pancha koshah na vak pani-padam na chopastha payu chidananda rupah shivoʼham shivoʼham

I am not the breath, nor the five elements,
I am not matter, nor the 5 sheaths of consciousness 
Nor am I the speech, the hands, or the feet,
I am the expression of consciousness and bliss,
I am the eternal Shiva...

na me dvesha ragau na me lobha mohau
na me vai mado naiva matsarya bhavaha
na dharmo na chartho na kamo na mokshaha chidananda rupah shivoʼham shivoʼham

There is no like or dislike in me, no greed or delusion, 
I know not pride or jealousy,
I have no duty, no desire for wealth, lust or liberation, 
I am the expression of consciousness and bliss,
I am the eternal Shiva...

na punyam na papam na saukhyam na duhkham na mantro na tirtham na veda na yajnah
aham bhojanam naiva bhojyam na bhokta chidananda rupah shivoʼham shivoʼham

No virtue or vice, no pleasure or pain,
I need no mantras, no pilgrimage, no scriptures or rituals, 
I am not the experienced, nor the experience itself,
I am the expression of consciousness and bliss,
I am the eternal Shiva...

na me mrtyu shanka na mejati bhedaha
pita naiva me naiva mataa na janmaha
na bandhur na mitram gurur naiva shishyaha chidananda rupah shivoʼham shivoʼham

I have no fear of death, no caste or creed,
I have no father, no mother, for I was never born,
I am not a relative, nor a friend, nor a teacher nor a student, 
I am the expression of consciousness and bliss,
I am the eternal Shiva...

aham nirvikalpo nirakara rupo
vibhut vatcha sarvatra sarvendriyanam
na cha sangatham naiva muktir na meyaha chidananda rupah shivoʼham shivoʼham

I am devoid of duality, my form is formlessness, 
I exist everywhere, pervading all senses,
I am neither attached, neither free nor captive, 
I am the expression of consciousness and bliss,
I am the eternal Shiva...