Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
Thinking like an owner means making sure that your responsibilities are handled well regardless of what comes up. While you are away on vacation, it's your responsibility to make sure nothing drops. You can do that via a combination of good planning and coordination before you go and staying on top of things while you are away. This needn't take much time--it can be as little as an hour of good checking from afar and it doesn't even have to be every day, so you can typically slip it in when it's convenient.