A monomaniac is a sick person ...

A monomaniac is a sick person whose mentality is perfectly healthy in all respects but one; he has a single flaw, clearly localized. At times, for example, he has an unreasonable and absurd desire to drink or steal or use abusive language; but all his other acts and all his other thoughts are strictly correct.
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 Emile Durkheim

Quotes from the same author

Man cannot become attached to higher aims and submit to a rule if he sees nothing above him to which he belongs. To free him from all social pressure is to abandon him to himself and demoralize him.
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 Emile Durkheim
Reality seems valueless by comparison with the dreams of fevered imaginations; reality is therefore abandoned.
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 Emile Durkheim
From top to bottom of the ladder, greed is aroused without knowing where to find ultimate foothold. Nothing can calm it, since its goal is far beyond all it can attain. Reality seems valueless by comparison with the dreams of fevered imaginations; reality is therefore abandoned.
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 Emile Durkheim
Society is not a mere sum of individuals. Rather, the system formed by their association represents a specific reality which has its own characteristics... The group thinks, feels, and acts quite differently from the way in which its members would were they isolated. If, then, we begin with the individual, we shall be able to understand nothing of what takes place in the group.
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 Emile Durkheim
The Christian conceives of his abode on Earth in no more delightful colors than the Jainist sectarian. He sees in it only a time of sad trial; he also thinks that his true country is not of this world.
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 Emile Durkheim