This is the key not just to professional success but also personal happiness. When someone takes “just a few minutes of your time,” they aren’t just robbing you (though they admit this when they ask to “pick your brain” and thus your pocket). They’re also robbing your family. They’re robbing the people who you serve. They are robbing the future. The same goes for when you agree to do unimportant things, or when you commit to too much at one time. Except this time, you are the thief.