I'm a proponent of positive thinking, focussing on good news, using affirmations to program positive self-belief etc. I think this all helps towards a healthy attitude of mind, which does impact on the health of the body. Also, positive thinking can lead to positive action, so in terms of continually creating a better world, it's a good place to start.
Recommended reading:
These are two books I always pick up when I'm feeling low, and they never fail to inspire me.
James Allen - As A Man Thinketh
Allen's musings on what makes a good human being are challenging and uplifting. As A Man Thinketh rarely leaves my bedside. You can read this, along with his other writings here:
http://www.jamesallenlibrary.com/as-a-man-thinketh.html
Louise Hay - You Can Heal Your Life
Hay's approach to holistic health through positive affirmations is simple, yet effective. It contains chapters relevant to different aspects of life, so is handy to dip into when facing a specific crisis - eg. Job success.
I'm also subscribed to the Good News Network. It does cost to subscribe, so I won't post the link, but it's easily found on google if anyone is interested. There are also plenty of other free to access good news blogs. eg.
http://www.goodnewsblog.com/, that help to create a positive mindset, especially with so much negativity in the mainstream press.