Arthur Koestler said this quote

“ It was quiet in the cell. Rubashov heard only the creaking of his steps on the tiles. Six and a half steps to the door, whence they must come to fetch him, six and a half steps to the window, behind which night was falling. Soon it would be over. But when he asked himself, For what actually are you dying? he found no answer.It was a mistake in the system; perhaps it lay in the precept which until now he had held to be uncontestable, in whose name he had sacrificed others and was himself being sacrificed: in the precept, that the end justifies the means. It was this sentence which had killed the great fraternity of the Revolution and made them run amuck. What had he once written in his diary? We have thrown overboard all conventions, our sole guiding principle is that of consequent logic; we are sailing without ethical ballast. ”