Because thinking is effortless, people are oblivious about the importance of controlling what they think, even though that’s the root of happiness.
Imagine swimming in a lake far from shore and you notice something peculiar. Like a bobber attached to a fishing line, your body floats with ease when your thoughts produce the emotions of joy, optimism, and contentment. And you lose buoyancy and start to sink when your thoughts produce the emotions of fear, worry, and anger.
