It was in her third year at Cambridge that she found the "moral courage", as she put it, finally to abandon the religious beliefs she had long been uneasy with.

In the preface to her book Morals Without Religion (1955), she wrote, "a fresh, cleansing wind swept through the stuffy room that contained the relics of my religious beliefs.

"[3] Between 1926 and 1936 Margaret worked as a librarian, information officer and editor for journal published by the National Institute of Industrial Psychology.

She married her husband Arthur Rex Knight in 1936, then in 1938 she started working alongside him as an assistant lecturer in psychology at the University of Aberdeen, Scotland.

An advocate of Scientific Humanism, Knight gave two short radio talks on the BBC Home Service in 1955[4] under the title Morals Without Religion.