These ideas, though well intentioned, might also be training us to generally avoid anything that makes us feel uncomfortable. And there are plenty of worthwhile things that might make you feel pretty uncomfortable. Moving to a new city for college can be uncomfortable. Applying for jobs and going on interviews is definitely uncomfortable. Picking up the phone and making a cold call to try to get an internship? Scary. Risking financial security to pursue your dream career? Seriously terrifying.
If it were up to that instant visceral reaction that tells us to run, we wouldn't try any of those things and we'd miss out on a lot of amazing opportunities. More importantly, we'd miss out on the chance to succeed. Don't let your fears stop you from living your dreams. So sorry, Ben Franklin, but it's time for an amendment: when in doubt, do it.