Taught is in past tense, when you say he taught it means he has already done it
It’s a shame, then, that the second part of Pauling’s advice tends to be overlooked: “Most of (your ideas) will be wrong, and what you have to learn is which ones to throw away.” It’s certainly true that most ideas written on a Post-It note or submitted to an online system never get used, but the reason has more to do with a bias toward short-term payback in most innovation processes than informed filtration
A theme is what the author wants you to get from the story only one does this, which is A
