Plagued by illness for much of his life since childhood, Simpson believed he experienced divine healing after understanding it to be part of the blessing of abiding in Christ as Life and healing. He emphasized healing in his Fourfold Gospel and usually devoted one meeting a week for teaching, testimonies and prayer on these lines. Although such teaching isolated him (and the C&MA) from the mainline churches that either did not emphasize or outright rejected healing, Simpson was uncompromising in his beliefs.