Sentence:  The Christian philosophy nominally attributes all natural evils, including sickness and death, to sin. But it has lost the connecting link between the moral disorders and the physical disorders which afflict us. ... It cannot understand ... how there are cancers and plagues and <WSD>hydrophobias</WSD> of the soul, the secret causes of those horrible diseases in the body. 
Meaning of the word marked with <WSD> tags:  An aversion to water, as a symptom of rabies;  the disease of rabies itself.