Joseph Murphy was a Divine Science minister and author. One of his best known works is "The Power of Your Subconscious Mind". I am not positive if this is the "Joseph Edward Murphy" from your question, but if his quotes are positive and deal with the potential of the subconscious he's probably your guy.
Edward Regan Murphy
Edward Murphy has written: 'DAK TO'
Arthur Edward Murphy was born in 1901.
Arthur Edward Murphy died in 1962.
Edward Sullivan Murphy was born in 1880.
Edward Sullivan Murphy died in 1945.
Edward Murphy - rower - was born in 1971.
Edward Preston Murphy died in 1958.
Edward Preston Murphy was born in 1904.
John Joseph Murphy was born in 1922.
Joseph R. Murphy was born in 1947.
Joseph Murphy - author - was born in 1898.