People usually think that progress consists in the increase of knowledge, in the improvement of life, but that isn’t so. Progress consists only in the greater clarification of answers to the basic questions of life. The truth is always accessible to a man. It can’t be otherwise, because a man’s soul is a divine spark, the truth itself. It’s only a matter of removing from this divine spark everything that obscures it. Progress consists, not in the increase of truth, but in freeing it from its wrappings. The truth is obtained like gold, not by letting it grow bigger, but by washing off from it everything that isn’t gold.

Source: Tolstoy’s Diaries (1985) edited and translated by R. F. Christian. London: Athlone Press, Vol 2, p. 512