What is the theme of When I have fears?

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1. #those
2. #expanse
3. #being
4. #essential
5. #poetry
6. #darker
7. #world
8. #common
9. #natural
10. #nature
11. #within
12. #lines
13. #before
14. #romantic
15. #theme
16. #represent
17. #water
18. #demonstrates
19. #writing
20. #shore
21. #fears
22. #keats
23. #giving