of these exercises is to develop higher levels of consciousness through meditation and observation. Details about the spiritual world, Steiner suggested, could on such a basis be discovered and reported, though no more infallibly than the results of natural science. Steiner regarded his research reports as being important aids to others seeking to enter into spiritual experience. He suggested that a combination of spiritual exercises (for example, concentrating on an object such as a seed), moral development (control of thought, feelings and will combined with openness, tolerance and flexibility) and familiarity with other spiritual researchers' results would best further an individual's spiritual development. He consistently emphasised that any inner, spiritual practice should be undertaken in such a way as not to interfere with one's responsibilities in outer life. Steiner distinguished between what he considered were true and false paths of spiritual investigation. In anthroposophy, artistic expression is also treated as a potentially valuable bridge between spiritual and material reality. Prerequisites to and stages of inner development Steiner's stated prerequisites to beginning on a spiritual path include a willingness to take up serious cognitive studies, a respect for factual evidence, and a responsible attitude. Central to progress on the path itself is a harmonious cultivation of the following qualities: Control over one's own thinking Control over one's will Composure Positivity Impartiality Steiner sees meditation as a concentration and enhancement of the power of thought. By focusing consciously on an idea, feeling or intention the meditant seeks to arrive at pure thinking, a state exemplified by but not confined to pure mathematics. In Steiner's view, conventional sensory-material knowledge is achieved through relating perception and concepts. The anthroposophic path of esoteric training articulates three further stages of supersensory knowledge, which do not necessarily follow strictly sequentially in any single individual's spiritual progress.Stein, W. J., Die moderne naturwissenschaftliche Vorstellungsart und die Weltanschauung Goethes, wie sie Rudolf Steiner vertritt, reprinted in Meyer, Thomas, W.J. Stein / Rudolf Steiner, pp. 267–75; 256–7. By focusing on symbolic patterns, images, and poetic mantras, the meditant can achieve consciously directed Imaginations that allow sensory phenomena to appear as the expression of underlying beings of a soul-spiritual nature. By transcending such imaginative pictures, the meditant can become conscious of the meditative activity itself, which leads to experiences of expressions of soul-spiritual beings unmediated by sensory phenomena or qualities. Steiner calls this stage Inspiration. By intensifying the will-forces through exercises such