I read in the newspaper that the Catholic Church finally decided that it had been theologically improper to try to convert the Jews. Whoops! Sorry for all those inquisitions, crusades, and autos-da-fe. Previous popes were wrong - infallible, perhaps, but wrong.
Everywhere in the world there are ignorance and prejudice, but the greatest complex of these, with the most extensive prestige and the most intimate entanglement with traditional institutions, is the Roman Catholic Church.
Since you cannot do good to all, you are to pay special attention to those who, by the accidents of time, or place, or circumstances, are brought into closer connection with you.