It’s all in there somewhere, the hidden gems in all the ‘holy books’, but it’s all buried in specious comment and lurid wrongheaded thoughtful interpretation by those who have not ‘attained the goal’ and so the whole lot appears, to the critical sense, to be nonsense.
It’s often clearer in the little sayings.
‘A full vessel can hold no more’
So, it is necessary to empty the vessel to let anything else in.
What’s it full of? Self. So what do you have to empty out? The self. Then there’s room for the no-self, the no-thing.