A fascinating thought that ties together threads from so many books, blogs and discussions.
Productivity ninja, getting things done, deep work, the organized mind, finding flow, the critical thinking lectures, zen to done, peak performance, black box thinking. Only now do I realise that in their own way, all of them are tackling this question.

The next line in The art of learning is:
“I believe the answers to this question are the gateway to the most esoteric levels of elite performance.”

It’s not what you know but what you are able to do with that knowledge.