A Year Looking on the Bright Side

We all have the best intentions on January 1st—making resolutions to eat healthier or workout more or get more sleep. What if you made a resolution to live more gratefully? That’s the goal Janice Kaplan set for herself in her New York Times bestselling book, The Gratitude Diaries.

She writes in the first chapter, “I knew that how I felt about the twelve months ahead would probably have less to do with what actually happened than with the mood, spirit, and attitude I brought to each day.”

Jan...