PHILOSOPHY, THE GUIDE OF MENTAL LIFE 275 



Spinoza's attempt to escape from this dilemma by regarding 

 matter and spirit as aspects of unity still leaves us in ignorance of 

 this all-embracing unitary ultimate. Robert G. Ingersoll, the 

 great agnostic, wrote: "Our ignorance is God; what we know is 

 Science." But the separation of knowledge from ignorance de- 

 mands successful mental effort, and assumes a mind capable of this. 

 Furthermore, as we enlarge the frontiers of our knowledge, we 

 correspondingly enlarge the frontiers of our ignorance, thus com- 

 ing more and more into contact with the unknowns and unknow- 

 ables which Ingersoll termed God. 



EVENSONG 



However vast our strength or frame, 

 Or great our power, our wealth or name, 

 Lord, You are Father of us all, 

 And we are but Your children small. 



Like curious children, we explore 

 And open many a wond'rous door — 

 To other doors, but not our goal, 

 The master-mystery of soul. 



With child-like faith, without a care, 

 At eve we quietly prepare 

 Ourselves in dreamless sleep to lay, 

 Until You waken us next day. 



REFERENCES 



1 Hackh's "Chemical Dictionary" defines it thus: 



"Within the atom it is meaningless to define both the position and the velocity 

 of the electron, because ^x, the error of specifying the velocity of x, multiplied 

 by £±P> tne error in specifying the position p, is always of the order of magnitude 

 of Planck's constant, h; that is xxp~h. Hence, assuming a definite velocity, only 

 approximate position is possible; likewise, assuming a definite position, only ap- 

 proximate velocity can be calculated." 



2 Charles Galton Darwin, Presidential Address before the Section on Mathematical 

 and Physical Science, British Association for the Advancement of Science, Science 

 (1938) 88, 155-160. 



3 Bertrand Russell, Atlantic Monthly, August, 1930. 



4 On this question there is an interesting paper by Professor Edward Kasner 

 (Columbia University) in Scripta Mathematica (January, 1938) entitled "New Names 

 in Mathematics." Kasner defines a googol as 10 to the 100th power, and a googolplex 

 as 10 to a power represented by a googol. This latter number is so great that we 

 could go out to the farthest star and then make a tour of the nebulae, writing down 

 zeros all the way in an attempt to express it. (What a few mathematical signs can 



