Who said "Crime is a sort of madness."?

This quote is attributed to Porfiry Petrovich.

Crime is a sort of madness. - Porfiry Petrovich

"Crime is a sort of madness."

Porfiry Petrovich

Character in Crime and Punishment

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"I simply cannot bring myself to believe in the extraordinary faculties of certain individuals."

"We all have demons within us."

"Life is not a mathematical problem."

"Freedom without morality is destruction."