Our acquaintances—not our friends—are our greatest source of new ideas and information. the internet lets us exploit the power of these kinds of distant connections with marvellous efficiency.
My writing model is my mother, who is a writer as well. She always valued clarity and simplicity above all else. If someone doesn't understand what you're writing, then everything else you do is superfluous. Irrelevant. If any thoughtful, curious reader finds what I do impenetrable, I've failed.
We sometimes think of being good at mathematics as an innate ability. You either have "it" or you don't. But to Schoenfeld, it's not so much ability as attitude. You master mathematics if you are willing to try.
That fundamentally undermines your ability to access the best part of your instincts. So my advice to those people would be stop thinking and introspecting so much and do a little more acting.