It is therefore that in the Sufi cult practices are given to make the mind as well as the senses proper tools for the will-power to use. As the plant is sprung form the earth, but is nourished by the rain falling from the sky, so the will-power springs from within, but is developed by external activities. It must be remembered that the inner life reflects on the outer life and the outer life reflects on the inner life; both parts of life are interdependent.