Sentence:  We have staved off a war and , since our behavior has involved all these elements , we can only keep <WSD>adding</WSD> to our ritual without daring to abandon any part of it , since we have not the slightest notion which parts are effective . 
Meaning of the word marked with <WSD> tags:  make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of