I don’t really regret strategic errors or poor tactical decisions or career missteps (I made plenty of those.) I certainly regretted those things then, but now, not really. Instead I most regret the things I didn’t say: To employees who reported to me, to some of my peers, and to at least one person I worked for. Those are moments I’d like to have back. It’s too late for me, but it’s not too late for you. Here are five things you should say—today—to people you work with: