Gratitude has been shown to increase happiness, help make friends, and help deal with hardship. You should really watch this wonderful Kurzgesagt video to learn more.
From The School of Life:
A set of 60 cards to remind us of the many reasons we have to be thankful.
We are experts at focusing on what is missing from our lives. Our dissatisfaction often serves us well; it keeps us from complacency and boredom. But we are also dragged down by a pernicious inability to stop, take stock and recognise what isn't imperfect and appalling.
In our haste to secure the future, we omit to notice what is already very good. This pack of cards is designed to help us pause in our striving and, for a few moments, take on board some of what we have to be grateful for - a consoling, inspiring corrective to the lessons in cynicism and sourness that the world teaches every day.