Letters to Unknown Friends is a collection of personal letters written by Lyman Abbott, an American Congregationalist minister, editor, and author. The letters were originally published in The Outlook, a weekly magazine that Abbott edited from 1893 to 1921. The book contains letters that were written between 1898 and 1921, and they cover a range of topics, including religion, politics, literature, and social issues. The letters are addressed to unknown...