34 PROGRESS OF SCIENCE IN THE CENTURY. 



ficiently self-critical. To rise above particular criti- 

 cisms to a general basis of criticism would be a great 

 gain, and perhaps this may be found in a recognition 

 of what may be called The Three Unities. 



UNITY OF LIFE. 



The first of these unities is the Unity of Life. We 

 have already referred to the three main moods or atti- 

 tudes of mind observable in human relations to na- 

 ture practical, emotional, and scientific. They find 

 expression in doing, feeling, and knowing; in prac- 

 tice, in art, and in science; they may be symbolised 

 by hand, heart, and head. 



We are not of course supposing the existence of 

 altogether separable faculties, or nonsense of that 

 sort; we do not say that there are any purely prac- 

 tical, or exclusively emotional, or solely scientific 

 men; we simply note what appears to be a fact of 

 life that we can practically distinguish around us 

 the doers, the feelers, and the knowers. And as 

 one of the moods often has temporary dominance, 

 we are all apt to err in over-doing, or over-feeling, or 

 over-knowing. 



It is believed by most comparative physiologists 

 that the ears of many of the simpler animals are 

 not hearing ears, but rather directive organs, impor- 

 tant in balancing, equilibrating, and orientation. It 

 is such an equilibrating organ that we all need to 

 help us to adjust the balance of our moods. 



Our thesis then is that some measure of complete- 

 ness of life in ideal at least is the condition of 

 sanity in human development. A thoroughly sane 

 life implies a recognition of the trinity of knowing, 

 feeling, and doing. It spells health, wholeness, holi- 

 ness, as Edward Carpenter has said. 



