LETTERS TO BROTHER JOHN. 271 



Health and strength depend on rapid disor- 

 ganization 



Rapid disorganization depends on rapid exertion 



Therefore, health and strength depend on rapid 

 exertion. 



From the whole, then, there results this general 

 conclusion; that there can be no such things as 

 perfect health and strength, without bodily exertion 

 that it is contrary to the very scheme of man's 

 existence that it is not in the nature of things 

 and that the philosophy of life and health, the light 

 of science, the testimony of all ages, and the 

 irresistible force of irrefutable argument, prove it 

 to be impossible. 



But there is another powerful argument, proving 

 the necessity of bodily exertion. You must have 

 observed, in reading my former Letters, that every 

 thing no matter what that every thing which is 

 done in the body, is done by virtue of the circula- 

 tion of the blood. You must have remarked, that 

 all the phenomena constituting life and health are 

 effected, directly or indirectly, by the circulation; 

 that, almost, thought itself 'is the result of it; most 

 certainly, the power of thinking is greatly modified 

 by it. 



Seeing, then, that the blood's fluxion is the all- 



