V. Connections Between Organic Processes and the Mental Life of Man

If you study in the same manner all that is connected with the kidneys and excretory system you will discover that they concentrate within themselves the forces which, in the following incarnation, influence the head organization preferably in the field of affective emotions. The kidneys, the organs of excretion, bring forth in preparation for the next incarnation essentially that which has to do with the temperamental tendencies in the broadest sense, but by a detour through the head organization.