It is the state of vibrations to which man is tuned that accounts for his soul's note. The different degrees of these notes form a variety of pitch divided by the mystics into three distinct grades.

1. First, the grade which produces power and intelligence and may be pictured as a calm sea.
2. Secondly, the grade of moderate activity which keeps all things in motion and is a balance between power and weakness, which may be pictured as the sea in motion.
3. Thirdly, the grade of intense activity which destroys everything and causes weakness and blindness; it may be pictured as a stormy sea.