RATIONAL LIFE 283 



exercise, and thereby regulating physical action, is 

 a view of the mental life. There are two sides of the 

 nature, certainly, but they are two forms of life, each with 

 its own distinct centre of activity brain, the centre of 

 all organic action ; intellect, the centre of all rational 

 effort. The brain cannot do what mind does ; mind 

 cannot do what the brain does. We thus obtain two 

 visions of human life, incapable of being blended in 

 any single glance, or of lying within the area of any 

 scientific observation. We can no more see with the 

 eye into the conscious life, than we can see into the 

 consciousness of a fellow-man. On the other hand, 

 we can no more be conscious of the structure and 

 working of the organ of vision the Eye, which Plato 

 likened to the soul than the Soul can show itself in 

 the visible world. Such duality is an altogether new 

 thing in the history of life. It is new to science. 

 Biology has no counterpart to show. Of the reality, 

 there is clear proof. Whatever difficulty there may 

 be as to the moment in individual life when the soul 

 appears whatever uncertainty as to the natural law 

 regulating its appearance as part of the inheritance of 

 the race, there is no doubt of its presence. To include 

 an explanation of the rational life is an obvious part 

 of the demand on modern science. Only in recogni 

 tion of this duality, and at the same time in un 

 reserved acknowledgment of life s unity, can human 

 nature be understood. Two sides of the same thing 

 is an impossible representation. It includes no 

 account of the governing power of intelligence, the 

 grand distinction of humanity. This order of life 

 transcends organism and its functions. Equally 

 impracticable is the representation of man as purely 



