This paper projects Swami Vivekananda as a preacher of spiritual idealism laying focus on Indian spirituality and his stature as a key person and tallest figure in bringing out social and religious reformation by adding preaching and practice as twins for spiritual idealism which is part and parcel of ancient Indian thought, philosophy and culture. It also analyses how he brings home an important point that spirituality is an essential part of life to lead a peaceful and happy life. No doubt Swamiji stands out as an unique figure in his conception of the importance of physical nature of man which is due to the presence of spirituality innate in man. As a spiritual leader he longed to see a dynamic religion which is beautifully picturised in this paper.