THE SCIENCE OF HAPPINESS 



that the muscles exert a direct influence over the brain. 

 Now we know that the brain is the organ of the mind. 

 The brain may not "secrete thought as the liver secretes 

 bile," as some of the cruder old-time philosophers 

 phrased it, but physical action of the cells of the brain 

 is essential to the production of conscious mind, however 

 the metaphysicians may strive to evade that fact. 

 Whatever the rationale of the link that binds brain and 

 mind, the link exists. A healthy brain has its counter- 

 part in a healthy mind, and a diseased brain will pro- 

 duce I use the word advisedly a diseased mind. 

 Therefore, since an altogether healthy brain can exist 

 only in an altogether healthy body the integrity of the 

 mind is indirectly but very vitally dependent upon 

 the integrity of every cell of the body. 



And that is another way of saying that in a very 

 practical and vital sense every organ of the body is a 

 mind organ, hence that everything that tends to pro- 

 mote the health of the remotest cell of the body tends 

 also to promote the mental health of the individual of 

 whose body that cell is a part. 



It follows, as an irrefutable corollary, that no mind 

 can attain the greatest development of which it is poten- 

 tially capable unless the body that it animates under- 

 goes a corresponding development. I do not mean to 

 say that a powerful mind may not reside in a frail body. 

 Such a statement would be palpably absurd. Both 

 minds and bodies have their hereditary limitations. 

 I do mean to say that the powerful mind in the frail 

 body would be yet more powerful capable of more 



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