Fyodor Dostoevsky,
The Brothers Karamazov — Part III, Book VII, Chapter 2
(1880)
“ This new something was the harassing impression left by the conversation with Ivan, which now persistently haunted Alyosha's mind. At this moment it haunted him. Oh, it was not that something of the fundamental, elemental, so to speak, faith of his soul had been shaken. He loved his God and believed in Him steadfastly, though he was suddenly murmuring against Him. Yet a vague but tormenting and evil impression left by his conversation with Ivan the day before, suddenly revived again now in his soul and seemed forcing its way to the surface of his consciousness. ”
