Jim Collins, famous author of the mega-bestseller Good to Great , once suggested that instead of to-do lists, we should make "stop-doing" lists. Because in obsessing over to-do lists full of things that don't really matter, we spend less time saying yes to the things that do. Here are seven things the most successful people say no to on a regular basis. Perhaps you should too? 1. They say no to opportunities and things that don't excite them, speak to their values, or further their mission in life. 2. They say no to superficial networking events in which people swap business cards and never hear from one another. Why? Because successful people don't network. They build relationships. 3. They say no to spending time with uninspiring, critical, or negative people who drag them down. Time is precious -- choo