Sentence:  Piepsam 's fatal rage arises not only because he cannot stop the cyclist , but also because God will not stop him ; as Piepsam says to the crowd in his last moments : `` His justice <WSD>is</WSD> not of this world '' . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)