I think there's another layer of confusion, especially in this field, when modern minds read classical texts and assume modern meanings.
With you on the mind, though. I still flick through
The Master and his Emissary, although I recognise that McGilchrist is not the last word on neuroscience.
I have said the underlying motive of life is union.
The attempt to align old statements to new is an expression of this unifying principle.
If you can't bring it in, you are resisting union.
Resisting surrender of that which has gone astray - satan.
Sin also means to go astray, to miss.
Seek union and you will find the one truth.
Shiva is the name given to original union.
Hence Shiva is truth.
His is the First Yogi, hence original union.
He is the Lord of Om, the Word, sound.
He is Maheshvara.... Great Lord
Mahadevi... Great God.
The first teacher of union, Guru.
It is the principle in us towards union.