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.
Seek ye first the kingdom of God, and everything else shall be added unto you. This is the one great duty, this is renunciation. Live for an ideal, and leave no place in the mind for anything else.
-Swami Vivekananda