Swami Vivekananda stressed on the positive attitudes of life- love, harmony, service and the like. Some of these concepts find echo in an emerging trend of psychological studies called Positive Psychology. In fact, most of these traits are considered as marks of spiritual wisdom.
Realize your true nature. That is all there is to do. Know yourself as you are -- infinite spirit. That is practical religion. Everything else is impractical, for everything else will perish.
-Swami Vivekananda