The moment we define a goal for ourselves, we end up sharing with the world. But research tells us that people who talk about their ambitions may be less likely to achieve them.
What really happens when you start sharing is that you tend to get a false sense of achievement (after hearing your friends’ congratulations et al). The key is to keep your mouth shut.
Watch this video where Derek Sivers (the famous musician turned circus clown turned entrepreneur) shares few experiments from 1920s.