Because of the Emotions = Desires + Beliefs + Experience equation, you can shut your eyes (eliminating experience) and think about something you want to surface your beliefs about it. Positive feelings = Positive beliefs (and vice versa).
https://yourmeaninginlife.com/blog/wanting-and-feeling-good-vs-wanting-and-feeling-bad
You can always find a reason to complain, and you can always find a reason to be grateful. The former will lead to a miserable life; the latter will lead to a more pleasant life.
https://yourmeaninginlife.com/blog/it-will-always-be-something
There are many misconceptions about how important growth is to your life, from what kinds of growth are possible, whose growth is meaningful, and how growth is meaningful even in the face of endings and death.
https://yourmeaninginlife.com/blog/misconceptions-about-growth-oriented-meaning