Jews have never had their own country for thousands of years, and they can only live in other people's society (usually Christianity or Islam) as a group of strangers (they are usually unaffected by local old ideas and prejudices, and every new trend is often spread through Jews who have no burden, so many old forces think they are saboteurs and schemers). Monarchs and even the masses in these places can deprive them of their property or personal freedom at will, as well as a considerable number of Jews themselves. And there will be priests (scholars) in Judaism and Jewish communities. Learning and acquiring knowledge is not only an important way to step onto the social ladder, but also an important way to step onto the belief ladder.