GANAPATI ATHARVASHEEERSHA: Part 2 English explanation

SRI GURUBHYO NAMAH SRI PARAMA GURUBHYO NAMAH SRI PARAMESHTHI GURUBHYO NAMAH

hariH Vishnu;
OM; Omkara or Brahma; Hari Om also signifies “AHAM BRAHMASMI”
Nmaste salute to you , GanapatayE to Ganapati;
ತ್ವಮೇವ = tvamEva you only;
ಪ್ರತ್ಯಕ್ಷಂ- Pratyaksham can be perceived by the senses.
Tat that.
Tvam you.- asi

Tatvam asi is explained in 6-8-7 ( 6 th Ch 8 th Section and 7 Th verse) Chandogya Upanishad of Samaveda.
ಸ ಯ ಏಷೋsಣಿಮೈ ತದಾತ್ಮ್ಯಮಿದಃ ಸರ್ವ ತತ್ ಸತ್ಯಃ ಸ ಆತ್ಮಾ ತತ್ವಮಸಿ – This verse further continue but for us this much is enough now. That itself is the source called Existence. The Truth, the Supreme Reality, Hence that indeed is ATMA, the self of the world, its most essence, its quintessence, its very reality, because the word, self when when not preceded by any word, conventionally denotes the innermost SELF. Hence you are that Existence. You here refers to Svetaketu to whom his father Uddalaka mentioned.
By telling to Ganapati You are Tatvamasi, conveys that The SELF, the brahman, the Atman is none other than Ganapati.
We find reference to Tatvamasi also in Verses 253 & 262 in Vivekachudamani Composed by Sri Shankara Bhagavatpadacharya.
जातिनीतिकुलगोत्रदूरगं
नामरूपगुणदोषवर्जितम् ।
देशकालविषयातिवर्ति यद्
ब्रह्म तत्त्वमसि भावयात्मनि ॥ २५४ ॥
jātinītikulagotradūragaṃ
nāmarūpaguṇadoṣavarjitam |
deśakālaviṣayātivarti yad
brahma tattvamasi bhāvayātmani || 253 ||
253. That which is beyond caste and creed, family and lineage; devoid of name and form, merit and demerit; transcending space, time and sense-object – that Brahman ar thou, meditate on this in thy mind.यच्चकास्त्यनपरं परात्परं
प्रत्यगेकरसमात्मलक्षणम् ।
सत्यचित्सुखमनन्तमव्ययं
ब्रह्म तत्त्वमसि भावयात्मनि ॥ २६२ ॥
yaccakāstyanaparaṃ parātparaṃ
pratyagekarasamātmalakṣaṇam |
satyacitsukhamanantamavyayaṃ
brahma tattvamasi bhāvayātmani || 262 ||
That beyond which there is nothing; which shines even above Māyā, which again is superior to its effect, the universe; the innermost Self of all, free from differentiation; the Real Self, the Existence-Knowledge-Bliss Absolute; infinite and immutable – that Brahman art you, meditate on this in your mind.