8 lectures, Dornach, Sep-Oct, 1920 (CW 322)

"We must begin by acquiring the discipline that modern science can teach us. We must school ourselves in this way and then, taking the strict methodology, the scientific discipline we have learned from modern natural science, transcend it, so that we use the same exacting approach to rise into higher regions, thereby extending this methodology to the investigation of entirely different realms as well." --Rudolf Steiner

If only sensory phenomena are within the reach of scientific research, the doors are closed to...