|| एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि ||

Intelligence which is basis of creation 
from (for example) rich_soil-plant-flower or food-cell-human or
pure_potential-to-bigbang-to-universe is beyond
complete reach of external-perception-emotion-intellect
but only pure inner-subjective experience and learning
from inner and external experience - Sadhguru

सत्य is subjective experience, 

so is  GOD is || एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि || to those 

only because he lives in awareness of souls 

who remember him/her. 

Those souls do not  have to convince others to believe in

 what they have experienced, 

but form a group of same minded souls to support weakest souls

|| एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि ||

Be Still and know || एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि || is God - Psalm 46:10,

|| एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि || is beyond touch of karmic memory,

|| एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि || is beyond touch of ego identity,
|| एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि || is beyond touch of rational intellectual understanding,

|| एकमेवाद्वितीयम् || - || अहं ब्रह्मास्मि || is but only pure attention (observer & caretaker), 

pure existence (source of manifestation), 

pure joy (experience of joy beyond understanding)

What is || अहं ब्रह्मास्मि || in clear language ?

Aside from external influences,

One is source of creation of oneself,

The source of creation in deep within oneself 

and is of "Be Still" nature.

- Sadhguru

The Witness SatChitAnanda

THE WITNESS is very much able to observe thoughts, emotions, sensory experiences, past memories, and intentions, all of which are manifest in mind or world and have qualities (SAGUNA),

With very pure and stable intellect maybe then one can observe THE WITNESS by THE WITNESS for THE WITNESS in mirror of PURE STABLE INTELLECT, and THE WITNESS itself is unmanifest and without qualities (NIRGUNA),

HOLY TEXTS mention that THE LORD is NIRGUNA and SAGUNA BOTH,

Buddha's Experience of Emptiness - NIRGUNA,

Tao of Tao-Te-Ching - NIRGUNA,

"Being in World but not of World" - Jesus - NIRGUNA and SAGUNA,

Idol Worship - SAGUNA,

Science - (manifestation SAGUNA) and (Unified-Quantum-Field and Consciousness NIRGUNA),

Allah - NIRGUNA,

Krishna - NIRGUNA and SAGUNA,

Jainism - Soul (NIRGUNA) and Body (SAGUNA).

Sikhism - Nirankar, Akal, Agam Agochar - The Creator

and Teaching of Gurus - Saguna

ੴ ਸਤਿ ਨਾਮੁ ਕਰਤਾ ਪੁਰਖੁ ਨਿਰਭਉ ਨਿਰਵੈਰੁ ਅਕਾਲ ਮੂਰਤਿ ਅਜੂਨੀ ਸੈਭੰ ਗੁਰ ਪ੍ਰਸਾਦਿ॥

ਸਤਿ ਸ਼੍ਰੀ ਅਕਾਲ - God is TRUTH, GREAT, ETERNAL

Definition of Pure Un-manifested Nirguna Consciousness

using Neti-Neti Process

आत्मषट्कम् or निर्वाणषट्कम् श्लोक (नेति नेति)

- श्री आदि शंकराचार्य

मनोबुद्ध्यहङ्कार चित्तानि नाहं

न च श्रोत्रजिह्वे न च घ्राणनेत्रे ।

न च व्योम भूमिर्न तेजो न वायुः

चिदानन्दरूपः शिवोऽहम् शिवोऽहम् ॥१॥

न च प्राणसंज्ञो न वै पञ्चवायुः

न वा सप्तधातुः न वा पञ्चकोशः ।

न वाक्पाणिपादं न चोपस्थपायु

चिदानन्दरूपः शिवोऽहम् शिवोऽहम् ॥२॥

न मे द्वेषरागौ न मे लोभमोहौ

मदो नैव मे नैव मात्सर्यभावः ।

न धर्मो न चार्थो न कामो न मोक्षः

चिदानन्दरूपः शिवोऽहम् शिवोऽहम् ॥३॥

न पुण्यं न पापं न सौख्यं न दुःखं

न मन्त्रो न तीर्थं न वेदा न यज्ञाः ।

अहं भोजनं नैव भोज्यं न भोक्ता

चिदानन्दरूपः शिवोऽहम् शिवोऽहम् ॥४॥

न मृत्युर्न शङ्का न मे जातिभेदः

पिता नैव मे नैव माता न जन्मः ।

न बन्धुर्न मित्रं गुरुर्नैव शिष्यं

चिदानन्दरूपः शिवोऽहम् शिवोऽहम् ॥५॥

अहं निर्विकल्पो निराकाररूपो

विभुत्वाच्च सर्वत्र सर्वेन्द्रियाणाम् ।

न चासङ्गतं नैव मुक्तिर्न मेयः

चिदानन्दरूपः शिवोऽहम् शिवोऽहम् ॥६॥

Translation:

I am not mind, nor intellect, nor ego,

nor the reflections of inner self (reasoning).

I am not the five senses.

I am beyond that.

I am not the seven elements or the five sheaths (pañca-kośa).

I am indeed, That eternal knowing and bliss,

the auspicious, pure consciousness - SatChitaAnanda || 1 ||

Neither can I be termed as energy (prāṇa),

nor five types of breath

(vāyus - Prāṇa, Apāna, Vyāna, Udāna, Samāna),

nor the seven material essences,

nor the five sheaths (pañca-kośa).

Neither am I the organ of Speech,

nor the organs for Holding ( Hand ), Movement ( Feet ) or Excretion.

I am indeed, That eternal knowing and bliss,

the auspicious, pure consciousness - SatChitaAnanda || 2 ||

I have no hatred or dislike,

nor affiliation or liking, nor greed, nor delusion,

nor pride or haughtiness,

nor feelings of envy or jealousy.

I have no duty (dharma),

nor any purpose (artha),

nor any desire (kāma),

nor even liberation (mokṣa).

I am indeed, That eternal knowing and bliss,

the auspicious, pure consciousness - SatChitaAnanda || 3 ||

I have neither merit (virtue),

nor demerit (vice).

I do not commit sins or good deeds,

nor have happiness or sorrow,

pain or pleasure.

I do not need mantras, holy places,

scriptures (Vedas), rituals or sacrifices (yajñas).

I am none of the triad of

the observer or one who experiences,

the process of observing or experiencing,

or any object being observed or experienced.

I am indeed, That eternal knowing and bliss,

the auspicious, pure consciousness - SatChitaAnanda || 4 ||

I do not have fear of death, as I do not have death.

I have no separation from my true self,

no doubt about my existence,

nor have I discrimination on the basis of caste or creed.

I have no father or mother,

nor did I have a birth.

I am not the relative,

nor the friend,

nor the guru,

nor the disciple.

I am indeed, That eternal knowing and bliss,

the auspicious, pure consciousness - SatChitaAnanda || 5 ||

I am all pervasive.

I am without any attributes, and without any form.

I have neither attachment to the world,

nor to liberation (mukti).

I have no wishes for anything

because I am everything, everywhere,

every time, always in equilibrium.

I am indeed, That eternal knowing and bliss,

the auspicious, pure consciousness - SatChitaAnanda || 6 ||

- Adi ShankaraAcharya

What remains is || अहं ब्रह्मास्मि || - "Be Still and will know I am is GOD"