Sentence:  If only the discoverer of <WSD>autology</WSD> (self-knowledge) had said, "Let all drugs alone, even Detoxyl, eat simple, nutritious food, sleep and play and work in the open air, and don't worry — then acids and poisons will not accumulate in your system, you will have a high vitality and resisting power, disease and pestilence will pass you by. 
Meaning of the word marked with <WSD> tags:  The study of oneself.