This will sound like a rather odd recommendation, but here it is. I find Simon Sinek, author of Start with Why: How Great Leaders Inspire Everyone to Take Action, a little full of himself. I’d heard the advice to start with questions of purpose and passion years ago, well before he wrote his book, so the idea that he invented or came up with all this is, well, a bit much. And his work with brain science feels at the same time both oversimplified and overstated. Finally, while he may be a perfectly lovely human being, he comes across as a bit self-important. Having said all that, I’d still encourage you to watch his TED Talk, based on his...