  Drawing on Dilthey and Schleiermacher, Yorck argues that immediate and indubitable reality of life is exclusively “guaranteed” through volition and affectivity alone. Yorck writes: “That which opposes me or that which I feel, I call real,” because I cannot doubt what resists my will or affects my personal life, whereas it is always possible to doubt objects neutrally represented in space outside me (ST, p. 89). What is thought and grasped as an unchanging, stable and self-same object in the space of thought does not affect me or solicit a desire. For Yorck, cognition, in abstraction from feeling and volition, is the realm of pure “phenomenality,” which is always open to doubt in virtue of its being merely represented or thought (ST, p. 88). Because “the category of reality is a predicate of feeling and willing” alone (ST, p. 128), Yorck concludes that it is an “utterly uncritical” and self-contradictory undertaking to attempt to prove “the reality of the world” by means of the understanding (ST, p. 129). What Yorck writes to Dilthey in a more general vein is also applicable to this particular problem: