Ramanan in Tripura Rahasya

The Self does not admit of specification, and therefore no teacher can teach it. However, realise the Self within you, for it abides in unblemished intellect.

It pervades all, 
beginning from the personal God to the amoeba; 
but it is not cognisable by the mind or senses;
being itself unillumined by external agencies, it illumines all, everywhere and always. 
It surpasses demonstration or
discussion.

How, where, when, or by whom has it been specifically described even incompletely? 
What you ask me, dear, amounts to asking me to show your eyes to you.

Even the best teachers cannot bring your eyes to your sight. Just as a teacher is of no use in this instance, so in the other. 
He can at best guide you towards it and nothingmore. I shall also explain to you the means to realisation.
Listen attentively.

As long as you are contaminated with notions of me or mine (e.g., my home, my body, my mind, my intellect), the Self will not be found, for it lies beyond cognition and cannot be realised as ‘my Self’.

Retire into solitude, analyse and see what those things are which are cognised as mine; 
discard them all and transcending them, look for the Real Self.

🕉 Tripura Rahasya
✅ CHAPTER IX. Verses 8-14.