The following comes from an interview with Vietnamese Zen monk, peace worker, and author Thich Nhat Hanh. You can listen to the full interview at On Being (or read a transcript).
Mindfulness is a part of living. When you are mindful, you are fully alive, you are fully present. You can get in touch with the wonders of life that can nourish you and heal you. And you are stronger, you are more solid in order to handle the suffering inside of you and around you. When you are mindful, you can recognize, embrace and handle the pain, the sorrow in you and around you to bring you relief. And if you continue with concentration and insight, you’ll be able to transform the suffering inside and help transform the suffering around you.