If you know about the law of attraction and vibration, it seems that our feelings act to attract or repel the sum of possible circumstances, relationships and experiences of our lives. Largely, the law of attraction is saying (or so it seems to be saying to me) that we manifest however we feel.
If this is so then, it makes all the difference in our world, for us to get better at feeling as good as we can, with whatever our circumstances or experiences are. Or that, choosing to feel good is generally a good choice.
Or put another way, choosing the positive, even when we have lots of evidence otherwise, is generally the good choice.
Anything that anyone gives attention to, becomes true