The secret behind the whole manifestation is vibration, vibration which may be termed movement. It is the differences of vibration which, when divided by lines, form planes of existence, each plane being different in the rhythm of these vibrations. When we take life as a whole we can draw one line, the beginning and the end, or spirit and matter, or God and man. And we shall find that the rhythm which begins the line is free and without disturbance, and the rhythm which is felt at the end of this line is gross and disturbing. And these two rhythms may be named the life of sensation and the life of peace.