My fate, my reason, the very soul of the whole search, that is, the requirement for certitude, I entrust into the hands of the truth itself. For the truth’s sake, I renounce proof. In this lies the difficulty of the ascesis, that one brings as sacrifice what is most treasured, what is first and foremost, and knows that if this too deceives, if this sacrifice too is in vain, then one has no place to go. For it is the final means.
—The Pillar and Ground of the Truth