A founder named Marcus had done everything right — executive coach, mastermind, leadership programs, relentless self-investment — and was still stuck, having the same conversations on repeat. The problem wasn’t that he’d invested too little in his development; it was that he’d invested so much that his tools had become perfectly fitted to his existing thinking, producing no real friction anymore. This post draws a sharp distinction between sharpening — making your current thinking more effective — and expanding — developing a genuinely different kind of mind — and argues that most entrepreneurial development excels at the former while rarely delivering the latter. If you can’t remember the last time a conversation left you uncertain about something you thought was settled, that’s worth paying attention to.…