Every effect which is produced by color, sound or number depends upon their harmonious or inharmonious effect. If the sound is not harmonious, it has not a desirable effect upon us; if a color is not harmonious it also has an undesirable effect. This shows that it is not the particular number or sound which gives the desirable effect, but the harmony. That is why a knowledge of the effect of sound, color or number is insufficient without a development of a sense of harmony in oneself, so that one can understand the harmonious effect of these things.
