Full context:   Viktor Frankl, a psychiatrist and prisoner in the Nazi concentration camps during World War II, noticed that those who lost hope soon died, while those who held to meaning and purpose tended to live on. Frankl observed that joy and misery had more to do with a person's perspective and choice than with their surroundings. Three key sources of meaning that he highlights in his writings include the following: Psychologist Robert Emmons has identified the centrality of goals in pursuing happiness. He found that when humans pursue meaningful projects and activities without primarily focusing on happiness, happiness often results as a by-product. Indicators of meaningfulness predict positive effects on life, while lack of meaning predicts negative states such as psychological distress. Emmons summarizes the four categories of meaning which have appeared throughout various studies. He proposes to call them WIST, or work, intimacy, spirituality, and transcendence.