“Ever since, by his beloved brother’s deathbed, Levin had first glanced into the questions of life and death in the light of these new convictions, as he called them, which had during the period from his twentieth to his thirty-fourth year imperceptibly replaced his childish and youthful beliefs – he had been stricken with horror, not so much of death, as of life, without any knowledge of whence, and why, and how, and what it was. The physical organization, its decay, the indestructibility of matter, the law of the conservation of energy, evolution, were the words which usurped the place of his old belief. These words and the ideas associated with them were very well for intellectual purposes. But for life they yielded nothing, and Levin suddenly like a man who has changed his warm fur cloak for a muslin garment, and going for the first time into the frost is immediately convinced, not by reason, but by his whole nature that he is as good as naked, and that he must infallibly perish miserably.
From that moment, though he did not distinctly face it, and still went on living as before, Levin had never lost this sense of terror at his lack of knowledge.
He vaguely felt, too, that what he called his new convictions were not merely lack of knowledge, but that they were part of a whole order of ideas, in which no knowledge of what he needed was possible…
The question was summed up for him thus: ‘If I do not accept the answers Christianity gives to the problems of my life, what answers do I accept?’ And in the whole arsenal of his convictions, so far from finding any satisfactory answers, he was utterly unable to find anything at all like an answer.
He was in the position of a man seeking food in toy shops and tool shops.”
– Leo Tolstoy, Anna Karenina (p. 366)