If you want a shorter version, "grug brain, monk brain" pretends to profound, like "Zen mind, beginner's mind," but it's just a lazy take. If "grug brain, monk brain" was poetry, it would say:
We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And it'll look exactly the same because travel is pointless.
Is this a joke by mimicking someone on the mid-point of the 'bell curve meme' explaining the 'bell curve meme'?