Sentence:  We have every obligation to take seriously their claims to being democratic and free countries ; we also have , in consequence , the <WSD>duty</WSD> to appraise realistically and honestly their performance and to communicate our judgments to their leaders in frank but friendly ways . 
Meaning of the word marked with <WSD> tags:  the social force that binds you to the courses of action demanded by that force; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr