 For if we admit that with all our thoughts is harmonically combined a movement in the organs of the body, we will easily comprehend how to this sudden transposition of the mind, now to one now to another standpoint in order to contemplate its object, may correspond an alternating tension and relaxation of the elastic portions of our intestines which communicates itself to the diaphragm (like that which ticklish people feel). In connection with this the lungs expel the air at rapidly succeeding intervals, and thus bring about a movement beneficial to health; which alone, and not what precedes it in the mind, is the proper cause of the gratification in a thought that at bottom represents nothing.