I think people need their good moods/feelings (their feel-good chemical/neurotransmitter induced states of well being) to allow them to perceive (see) the good value, joy, beauty, happiness, love, and worth in their lives. I don't think our way of thinking, our outlooks, actions, and our value judgments alone allow us to truly see these qualities. I don't think we can experience any of these qualities without our good moods/feelings. I would like to add one last thing here. That is, this view of mine has been an issue for me and I wish to talk it out if you don't mind.