Positive Thinking For An Atheist?

I was asked on Facebook about positive thinking for an atheist. Here's my advice:

When it comes to positive thoughts you must learn to believe in yourself. Repeat after me: "I am an important person." "I can achieve my dreams." "I can make a difference." Say it every day a few times per day. You will come to believe what you say. So say it. Then dream big dreams. Don't be afraid to fail. You will fail from time to time. But you will learn for the next time. So dare to fail. And do not listen to the naysayers if you know they're wrong. They are a dime a dozen. You will never achieve anything unless you try. Find like-minded people to learn from who believe in you and hang out with them.