For in accord with the Eastern conception, the mandala symbol is not only a means of expression, but works an effect. it reacts upon its maker. Very ancient magical effects lie hidden in this symbol for it derives originally from the “enclosing circle,” the “charmed circle,” the magic of which has been preserved in countless folk customs. The image has the obvious purpose of drawing a sulcus primigenius, a magical furrow around the center, the templum, or temenos (sacred precinct), of the innermost personality, in order to prevent “flowing out,” or to guard by apotropaeic means against deflections through external influencs. The magical practices are nothing but the projections of psychic events, which are here applied in reverse to the psyche, like a kind of spell on one’s own personality. That is to say, by means of these concrete performances, the attention, or better said, the interest, is brought back to an inner sacred domain, which is the source and goal of the soul. This inner domain contains the unity of life and consciousness, which, though once possessed, has been lost, and must now be found again.
Jung, C. G. Psyche & Symbol. Ed, Violet S. de Laszlo. New York, NY: Anchor Books, 1958. 321-2