From Roosevelt and Churchill to Ziglar, Oprah, Les Brown, the Dalai Lama, and many others, renowned statements have all preached a positive attitude in life, through the quotes below:

1. "The only limit to our realization of tomorrow will be our doubts of today." - Franklin D. Roosevelt

2. "Believe you can and you're halfway there." - Theodore Roosevelt

3. "Positive thinking will let you do everything better than negative thinking will." - Zig Ziglar

4. "The greatest discovery of all time is that a person can change their future by merely changing their attitude." - Oprah Winfrey

5. "In every day, there are 1,440 minutes. That means we have 1,440 daily opportunities to make a positive impact." - Les Brown

6. "You are never too old to set another goal or to dream a new dream." - C.S. Lewis

7. "Positive anything is better than negative nothing." - Elbert Hubbard

8. "The pessimist sees difficulty in every opportunity. The optimist sees opportunity in every difficulty." - Winston Churchill

9. "Happiness is not something readymade. It comes from your own actions." - Dalai Lama

10. "Choose to be optimistic, it feels better." - Dalai Lama

Remember, a positive mindset can lead to greater happiness, resilience, and success in life.