Given the task definition and input, reply with output. Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'The Church has been called the extension of the Incarnation and the phrase is worth a moment 's thought .', Argument/Subject 1: 'church', Argument/Subject 2: 'incarnation'
be extension of