Be thankful for all your blessings. An appreciative person makes a pleasant and optimistic person.
Your determination to become a more optimistic person in every part of your life will do more to ensure your success and happiness than any other single quality you can develop.
The predominant quality of successful people is optimism.... Your level of optimism is the very best predictor of how happy, healthy, wealthy, and long-lived you will be.
By acting in a positive, pleasant and optimistic way, you become a positive, optimistic and enjoyable person.
Optimism is the one quality more associated with success and happiness than any other.