“My principal sin is doubt. I doubt everything, and am in doubt most of the time.”

“If in Doubt, don't do it”

“I don't allow myself to doubt myself even for a moment.”

“The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.”

“You're not going to be different ... you're going to be the same as you've always been; with doubts, everlasting dissatisfaction with yourself, vain efforts to amend, and falls, and everlasting expectation, of a happiness which you won't get, and which isn't possible for you.”

“At that instant he knew that all his doubts, even the impossibility of believing with his reason, of which he was aware in himself, did not in the least hinder his turning to God. All of that now floated out of his soul like dust. To whom was he to turn if not to Him in whose hands he felt himself, his soul, and his love?”

“The study was slowly lit up as the candle was brought in. The familiar details came out: the stag's horns, the bookshelves, the looking-glass, the stove with its ventilator, which had long wanted mending, his father's sofa, a large table, on the table an open book, a broken ash-tray, a manuscript-book with his handwriting. As he saw all this, there came over him for an instant a doubt of the possibility of arranging this new life, of which he had been dreaming on the road. All these traces of his life seemed to clutch him, and to say to him: 'No, you're not going to get away from us, and you're not going to be different, but you're going to be the same as you've always been; with doubts, everlasting dissatisfaction with yourself, vain efforts to amend, and falls, and everlasting expectations, of a happiness which you won't get, and which isn't possible for you.”