You must not under any pretense allow your mind to dwell on any thought that is not positive, constructive, optimistic, kind.

ISBN 0-06-250307-3
Power Through Constructive Thinking. ISBN 0-06-250335-9
The Seven Day Mental Diet : How to Change Your Life in a Week. His writing especially "The Sermon on the Mount" became popular in AA.

Emmet Fox (July 30 1886 – August 13 1951) was a New Thought spiritual leader of the early 20th century famous for his large Divine Science church services held in New York City during the Great Depression.