"One must manifest discipline of spirit; without it one cannot become free. To the slave discipline of spirit will be a prison; to the liberated one it will be a wondrous healing garden. So long as the discipline of spirit is as fetters the doors are closed, for in fetters one cannot ascend the steps. You can think of discipline of the spirit as wings. Whoever understands discipline of the spirit as a light that illumines the future worlds is already prepared. (preamble)"