Of the social issues Sheldon espoused during his lifetime, the two he was most passionate about were equality and prohibition. He believed that all persons were equal and should be treated as such. He was a pioneer among Protestant ministers in welcoming blacks into a mainstream church. He was also committed to fair treatment for Jews and Catholics, and proclaimed the equality of men and women. A strong supporter of the feminist struggle for equal rights, he urged women to enter politics. He also pushed for full equality in the workplace.