The union of spirit and nature is the basis of yoga. Nature must be ready to express the spirit. Will is the central tool of ordinary man to make it happen. One has to collect the scattered threads of consciousness involved in many things, focus it on the goal, offering it continuously to the divine so that it becomes pure and strong. This is the path of will.
About Savitri | B1C2-02 The Usefulness of Crisis and Tragedy (pp.12-13)