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“It is in these very items of knowledge which go beyond the world of senses, where experience can neither guide nor correct us, that reason carries out its investigations, which owing to their importance we consider to be far more excellent, and in their final aim far more sublime, than anything our understanding can learn in the field of appearances. Nay, we would rather dare anything, even at the risk of error, than surrender such investigations, either on ground of their precariousness or from any feeling of disdain or indifference. These unavoidable problems of pure reason itself are God, freedom, and immortality.”