Purnamidam: 'This is complete'

पूर्णमदः पूर्णमिदम पूर्णात पूर्णमुदच्यते
पूर्णस्य पुर्नामदय पुर्नामेवा वाशिश्यते

purnamadah: 'That is complete.'
purnamidam: 'This is complete.'
purnamadah purnamidam 'That is complete, this is complete'.
purnat purna mudachyate - 'From that completeness comes this completeness'
purnasya purnamadaya - If we take away this completeness from that completeness'
purnameva vashishyate: 'Only completeness remains.'

purnamadah purnamidam, the beginning is the Supreme Reality.
Described in the Upanishad as the Supreme Brahman, Para Brahman, The Ultimate Truth.
"That Supreme Reality is Complete'. It is purna, It is always full, complete and self-existing,
Permanent, The Supreme Reality remains when everything else perishes.
That Supreme Reality which knows no darkness but only effulgence.
Free of impurities and imperfections. It is complete and full.

What then is Supreme Brahman?
Purnamidam: 'This is also Complete.'
'That Supreme Truth is complete' and 'This is complete'
The Supreme Truth is not outside of yourself "All this is Brahman. All is Truth."
But, The Truth is veiled. You remove the veil, and all differences disappear .
Then "This Brahman ' becomes no different from 'That Brahman.'

The spiritual aspect of "This and That" differentiation, is caused by the separation in the mind.
'That is Complete, This is Complete.' Purnameva vashishyate- even if we are separating,
'That remains complete and purna.' It is the ultimate, of absolute unity - That, that is One.

 -Ishavasya Upanishad