Secondly, reason leads to evil and sin because it asserts that every individual faces certain doom. History demonstrates that all persons are finite and will sooner or later be crushed as mercilessly as if they were inanimate objects. So reason tells us that we have to accept our fate. To be wise means to bow before the inevitable. Only ideas, lifeless abstractions.
Reason ignores men of flesh and blood in favor of concepts like truth, goodness and beauty.
That is why Kierkegaard was so hostile to Hegel's philosophy of pure spirit. Hegelian idealism drained all the blood and passion out of men. Reason is the original sin because it dissects life by logical analysis, turning passionate individuals into logical categories. Fourthly, reason destroys men's ethical strivings. Rationalism transforins morality into eternal laws.