According to an article published by Harvard Medical School, they have found that gratitude can make a big difference in how we perceive our lives.
"Gratitude is a way for people to appreciate what they have instead of always reaching for something new in the hopes it will make them happier, or thinking they can't feel satisfied until every physical and material need is met. Gratitude helps people refocus on what they have instead of what they lack. And, although it may feel contrived at first, this mental state grows stronger with use and practice".
Take the time to discover what you can be grateful for and start spreading happiness in the world.