In her new book, “The Happiness Track: How to Apply the Science of Happiness to Accelerate Your Success,” Emma Seppala explains why happiness often paves the way for professional success. Unfortunately, she says, many workers have it backward, thinking that they need to be successful before they can ever be happy.
Call it workaholism or “successaholism” — Seppala, the science director for Stanford University’s Center for Altruism and Compassion Research and Education, says it’s a problematic cycle because it eventually leads to burnout and worse job performance.
Yet these behaviors are unlikely to disappear anytime soon because they’re encouraged by our friends, colleagues, and employers.
Source: Business Insider
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to write three letters of gratitude to people who had positively impacted their lives. The letters had to be nontrivial, insightful and reflective, and contain a high level of appreciation or gratitude expressed in a positive manner. Instead of writing letters, a control group filled out questionnaires. 
