"We must accept finite disappointment, but we must never lose infinite ___": Martin Luther King Jr. (4)

I believe the answer is:

hope

(Other definitions for hope that I've seen before include "writer" , "Trustful expectation" , "Aspiration" , "Bob --, US comic" , "English-born US comedian, d. 2003" .)

I've seen this clue in The Washington Post.

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