The answer is materialism. This is evident as the narrator wishes to go to a remote cabin in the woods and essentially live off the land while depriving himself of human contact and engaging with nature. No mention of religion is made in the passage, nor is there any concepts of turmoil that the narrator makes note of. Instead, he talks of his willingness to move to Innisfree, to live in a cabin simply, as he views it as his purpose.
        
                    
             
        
        
        
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1. A rare radioactive metal of the alkaline earth series.
2. The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
3. A gray, dense radioactive metal used as fuel in nuclear reactors.
4. A thing that is composed of two or more seperate elements. 
5. A white radioactive metal of the actincide series.
6. A binary compound of oxygen with another element or group.
7. The branch of biology dealing with the functions and activites of living organisms and their parts, including all pysical and chemical processes.
8. Rapidty of motion or operation.
9. Break up into small parts, typically as the result of impact or decay.