The positive effect of kindness on the immune system and on the increased production of serotonin in the brain has been proven in research studies. Serotonin is a naturally occurring substance in the body that makes us feel more comfortable, peaceful, and even blissful. In fact, the role of most antidepressants is to stimulate the production of serotonin chemically, helping to ease depression. Research has shown that a simple act of kindness directed towards another improves the functioning of the immune system and simulates the production of serotonin in both the recipient of the kindness and the person extending the kindness. Even more amazing is that persons observing the act of kindness have similar beneficial results. Imagine this! Kindness extended, received or observes beneficially impacts the physical health and feelings of everyone involved. Both the face of kindness and the face of creativity are smiling here.
When you’re unkind, you’re blocking the face of kindness. You’re moving away from the power of intention. No matter whether you call it God, Spirit, Source, or intention, be aware that unkind thoughts weaken, and kind thoughts strengthen, your connection. Creativity and kindness are essential aspects of intention.
Reference : The Power of Intention. Dr. Wayne W. Dyer