"Oh! I am sick of this unending force" should be: "Oh! I am sick of this unending farce".
Here is a perfect example of how the Internet compounds errors. In my hard-copy edition of "Selections from Swami Vivekananda", the word 'farce' is evident. Someone made a 'typo' several years ago, and now the poem features the word, 'force' instead of 'farce', on the Internet.
As a matter of fact, the correct line of this excellent, moving poem, does not bring up any results at all on Google. Such is 'misinformation' in the age of the Internet.
Thank you, respected web admin (Tom Ji) for pointing out this error which escaped my reading too. I apologize for not being extra careful in presenting the words of great souls like Swami Ji.