Gratitude and kindness are highlighted in this Edutopia article.
"It’s worthwhile to pause in the middle of all that excitement to build in reflective moments of gratefulness. Yet without a clear plan to foster classroom gratitude, we risk missing the improved attitude, improved physical and psychological health, and enhanced social and emotional skills that giving thanks can bring. Positive psychology suggests that learning to be thankful has benefits that extend far beyond the classroom walls, including lifelong happiness."