Butterfly Sometimes I just look up smile and say I know that was you shirt is a pretty shirt that you should have. Cultivating and expressing gratitude isn’t just good for your heart in a metaphoric sense; appreciation and positive emotions literally protects the vital organ. According to researchers, these feelings may be beneficial in the treatment of hypertension and reducing the likelihood of sudden death from congestive heart failure and coronary artery disease. Studies on optimism, a trait directly linked to gratitude, show an association between positive thinking and lower blood pressure levels. Researchers even found that the few times optimists did experience negativity, their blood pressure levels were as high as those observed among pessimists or anxious individuals, regardless of mood.