"It is extremely difficult for a Jew to be converted, for how can he bring himself to believe in the divinity of - another Jew?"

This quote by Heinrich Heine speaks with the problem of conversion for Jews. Heine is suggesting that it is hard for a Jew to convert to another religious beliefs because it would need them to believe in the divinity of another Jew. This is a referral to the fact that numerous religions, such as Christianity, have a single creator who is seen as divine. For a Jew to transform to such a faith, they would have to accept the divinity of somebody who is not Jewish. Heine is recommending that this is a hard principle for Jews to accept, as it goes against their own beliefs and traditions. Heine's quote highlights the difficulty of conversion for Jews, and the challenge of reconciling their own beliefs with those of another religion.