Did you know how you think has a ton of power over your happiness? It’s true. How we think shapes how we act, how we react, and ultimately, how we create our destiny and fulfill our purpose. Although you can’t change certain things that happen—or have happened to you in the past—each day, you choose how to respond to them. It might not feel that way at first, but a little practice with positive thinking makes a huge difference. Here’s how to start.