From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be language of', Sentence: 'Portuguese is the official language of Brazil , and it is found in every school , newspaper , television broadcast and business transaction .'
language

Given Relationship: 'discover', Sentence: 'They were all established in Polynesia before Columbus discovered America , and hence could not have been introduced by later Spanish vessels .'
discovered

Given Relationship: 'reveal in', Sentence: 'There is a difference between what men may think of God and what God has revealed of Himself in Christ .'

revealed