“My melancholy is the most faithful sweetheart I have had.”

“Faith is the most important factor in religious questions. If I am capable of grasping God objectively, I do not believe, but precisely because I cannot do this I must believe. If I wish to preserve myself in faith I must constantly be intent upon holding fast the objective uncertainty, so as to remain out upon the deep, over seventy thousand fathoms of water, still preserving my faith.”

“And this is one of the most crucial definitions for the whole of Christianity; that the opposite of sin is not virtue but faith.”

“If I am capable of grasping God objectively, I do not believe, but precisely because I cannot do this I must believe. If I wish to preserve myself in faith I must constantly be intent upon holding fast the objective uncertainty so as to remain out upon the deep, over seventy thousand fathoms of water, still preserving my faith.”

“Sitting calmly on a ship in fair weather is not a metaphor for having faith; but when the ship has sprung a leak, then enthusiastically to keep the ship afloat by pumping and not to seek the harbor--that is the metaphor for having faith. (Concluding Unscientific Postscript)”

“to have faith is precisely to lose one's mind so as to win God.”

“I have the courage, I believe, to doubt everything; I have the courage, I believe, to fight with everything; but I have not the courage to know anything; not the courage to possess, to own anything. Most people complain that the world is so prosaic, that life is not like romance, where opportunities are always so favorable. I complain that life is not like romance, where one had hard-hearted parents and nixies and trolls to fight, and enchanted princesses to free. What are all such enemies taken together, compared with the pale, bloodless, tenacious, nocturnal shapes with which I fight, and to whom I give life and substance?”