Quoting...

"Like the mechanical rabbit at the dog-racing track that speeds along just ahead of the dogs no matter how fast they run, aspirations and expectations about control [our own life, our autonomy] speed ahead of their realization, no matter how liberating the realization becomes."

"(...) Negative emotional states of mind narrow our focus. Instead of examining all aspects of a decision, we home in on only one or two, perhaps ignoring aspects of the decision that are very important. Negative emotion also distracts us, inducing us to focus on the emotion rather than on the decision itself."

"(...) Positive emotion has the opposite effect - when we are in a good mood, we think better. We consider more possibilities; we're open to considerations that would otherwise not occur to us; we see subtle connections between pieces of information that we might otherwise miss. (...) In general, positive emotion enables us to broaden our understanding of what confronts us."

Estas passagens foram tiradas do livro The Paradox of Choice, de Barry Schwartz.