<!-- wp:gutenberg-custom-blocks/featured-media {"id":4886649,"url":"https://api.time.com/wp-content/uploads/2014/04/happiness-survey1.jpg","caption":"","credit ...

The considered wisdom in positive psychology is that to feel better, you just need to think happy thoughts. If this conjures up the song “I Whistle a Happy Tune,” then you’re on the right track.

To help you express your heartfelt wishes, here’s a collection of over 100 messages, quotes, and greetings that are perfect ...