Yeah - it's a different kind of 'hard' though. It's TRICKY. And it requires concentration, because as soon as you stop concentrating, the old hypnosis of 'there is a self and it is me and I must protect and guard it and seek out things to attach to it.'
That's NOT a bad thing by the way. Without it, you could not calculate 'your' way to the grocery store to feed yourself. It's there to keep you alive. It's the Darwin part. You NEED it to live. But if you are attached to it, you will live in SOME version of Hell. It's no different from 'The World.' It's WHY 'Heaven is already around, in and amongst you.'
But TRICKY and takes practice and concentration to HOLD this mind that experiences the truth of no self.
You said "no divisions"
I say "no divisions because nothing to divide."
I teacher once said to me "it's not that nothing exists, it's that nothing exists really"
The Buddha didn't want to teach. He thought no one would get it.
He said "The Dharma is SUBTLE."
It IS. It is very very very very subtle, because you have to un-hypnotize yourself. How do you do that? The first step is realizing that you are in a dream. It's not that nothing is real, it's that 'it's real as a dream'. Then you have to understand that you can not know reality. It's not necessary to know reality. It's only necessary to NOT think what you think is reality is reality. It's only necessary to NOT be attached to 'this' 'that' 'me' 'my' 'I' 'good' 'bad'.
The curse in the garden wasn't 'good and evil'. It was KNOWLEDGE of good and evil. This is a difficult point. 'good and evil' at the most basic level do not exist. They DO exist in that ignorance causes suffering. But even suffering is only 'just like this.'
It is very very VERY f'ing subtly, so very very VERY subtle, that language can't touch it. (That's why the Tao Te Ching says 'The Toa that can be named is not the True Toa.'
But once you see it ... (you actually never see 'it' ... once you UNsee everything -> you will laugh laugh laugh like the Buddha!"
OK end of unedited turbo typing from work! Must go watch Argentina crush Croatia!
Alan Watts is where I learn about Indian philosophies and religions. The guy gave scores of lectures and all of them are easily understood and many are peppered with humor.
He held a class with young students and asked them, "What is a thing?"
And a bright girl raised her hand and said, "It's a noun."
And that's true: the root origin of "thing" is a "think" -- a speech convenience for identifying a cut-out from a unified world that we don't want to label.
So perhaps we should revise your teacher's phrase to:
"it's not that nothing exists, it's that no thing exists really"