Some good quotes about staying positive are Helen Keller's "Keep your face to the sunshine and you cannot see a shadow," and Joseph Campbell's "Find a place inside where there's joy, and the joy will burn out the pain." Another one is by Willie Nelson: "Once you replace negative thoughts with positive ones, you'll start having positive results."
Joyce Meyer said, "You cannot have a positive life and a negative mind." Studies suggest that positive thinking or optimism positively correlates to health and psychological wellbeing and that positive thinkers come out of difficult situations better than negative thinkers. Optimists face challenges head-on and take action to solve their problems, while pessimists easily give up attaining their goals. Positive thinking is responsible for five to 10 percent of the variation in the possibility of developing health problems, particularly depression, stroke and cardiovascular disease. Optimism may be a heritable trait, similar to intelligence and temperament and can be learned as it is also influenced by a person's social environment such as family environment.
"Positive thinking will let you do everything better than negative thinking will," according to Zig Ziglar. Some strategies that help one stay positive include surrounding oneself with other positive thinkers, doing positive self-talk, having a sense of humor and following a healthy lifestyle. Inspiration is also important for success as Tony Dorsett asserts: "To succeed, you need to find something to hold on to, something to motivate you, something to inspire you."