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.
The one eternal religion is applied to the opinions of various minds and various races. There never was my religion or yours, my national religion or your national religion; there never existed many religions, there is only the one. One infinite religion existed all through eternity and will ever exist, and this religion is expressing itself in various countries in various ways.
-Swami Vivekananda