When Johnson walked along the streets of London he was compelled to touch every post he passed; if he omitted one he had to return. He always went in or out of a door or passage in such a way that either his right or his left foot (Boswell was not certain which) should be the first to cross the threshold; when he made any mistake in the movement, he would return, and, having satisfactorily performed the feat, rejoin his companions with the air of a man who had got something off his mind. Napoleon I. could not pass through a street, even at the head of his army, without counting and adding up the rows of windows. Manzoni, in a letter (addressed to Giorgio Briano) which has become famous, declared that he was incapable of giving himself up to politics because he did not know how to decide on anything; he was always in a state of uncertainty before every resolution, even the most trifling. He was afraid of drowning in the smallest puddle, and could never resolve to go out alone; he confessed on various occasions that, from his youth up, he had suffered from melancholy.[115] He passed whole days without being able to apply himself to anything,[116] so that in a month there were five or six useful days during which he worked five hours, and then he became incapable of thinking.[117] Ugo Foscolo said that “very active in regard to some things, he was in regard to others less than a man, less than a woman, less than a child.”[118] Tolstoi confesses that philosophic scepticism had led him into a condition approximating to madness; let us add, to _folie du doute_. “I imagined,” he said, “that there existed nothing outside me, either living or dead; that the objects were not objects, but vain appearances; this state reached such a point that sometimes I turned suddenly round, and looked behind me in the hope of seeing _nothing_ where I was not.” “The deplorable mania of doubt exhausts me,” cried Flaubert, “I doubt about everything, even about my doubts.”[119] “I am embarrassed and frightened at my own ideas,” wrote Maine de Biran, “every expression stops me and gives me scruples. I have no confidence in anything that I publish, and am always tempted to withdraw my works when they have scarcely appeared, to substitute others which would certainly be worthless. I always call those happy who are tied down to fixed labour, who are not submitted to the torment of uncertainty, to the indecision which poisons men who are masters of their time. I am always trying my strength; I commence, and recommence again and again. It is my fortune to be useless, to be wanting in measure, never to feel my existence, never to have confidence in my capacity. I am never happy wherever I am, because I carry within my own organism a source of affliction and unrest. I have only sufficient feeling of my own personality to feel my impotence, which is a great torture. I am always ready to do a number of things ... and I do