Ensure you're not neglecting the bigger picture

If you diagnose yourself as an optimist, you might want to ensure you are at least noticing when the glass is half-full and for whom the glass is half-full, who doesn't have a glass at all, and who has two glasses. 

For pessimists, notice your attention. Consider which part of the picture you are obsessively dwelling on.

Yet, both optimists and pessimists would understand the reality of cycles because there are virtuous and vicious cycles: being unhappy, negative and hyper-critical can be a spiral downward. But they can also join virtuous upward spirals.