From the Isa Upanishad:
‘Into a blinding darkness go those who worship ignorance; into a greater darkness, those who delight in knowledge.’
From the Kena Upanishad:
‘Other is it than the Known; just as much, above the Unknown. Thus have we heard from our ancestors; so was it explained’
If you say: ‘I Know’, you are off; if you say: ‘I don’t Know’, you are equally off.
What’s common between them is the letter ‘I’.
The Perfection of Ignorance is the unwinding of the Self-Eating Expression: ‘I know nothing!’