Swami Muktananda and Gurumayi Chidvilasananda speak again and again about the Siddha Yoga Vision and Mission.
A good way to begin your study of the Siddha Yoga Vision and Mission statements is by listening to the recording of the Siddha Yoga Message for 2003, T*R*U*S*T, and by reading Gurumayi's books Enthusiasm, and Smile, Smile, Smile and Swami Muktananda's book Secret of the Siddhas.