24 The Evolution Hypothesis. 



have their counterpart in a corresponding demarca- 

 tion in thought. The great departments of inquiry 

 are mutually helpful, and throw light one upon the 

 other. They have much in common ; but they can 

 never be brought together in a complete unity of 

 knowledge. Each must in the main pursue its own aim 

 by' its own appropriate methods. The results reached 

 along this way will be solid additions to science and 

 valuable contributions to human well-being ; when, on 

 the other hand, research is set to the task of filling up 

 the empty outline of a universal system of organised 

 knowledge, it ceases to be the devotee of truth, and is 

 transformed into the advocate whose business is to 

 compel every fact to fit his theory, and every witness 

 to give such evidence as suits his case. 



The interests of science and of faith alike require 

 that thought should recognize the bounds set to it, and, 

 accepting its appointed conditions, work out patiently, 

 and with veracity, its task of deciphering such pages 

 of the book of the universe as are open to the view 

 of man. He is a false prophet of the natural who 

 will profess to write out the whole, or even to furnish 

 a complete table of contents. One of the greatest of the 

 prophets of the spiritual has laid down a principle as 

 entirely applicable to scientific as to religious thought : 

 " We know in part and we prophesy in part." * The 

 complete unification of knowledge is impossible. 



* 1 Corinthians xiii. 9. 



