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Experience Is Forgotten Throughout Kant’s writings about his ethical system, he stresses that the only way to effectively base an argument is entirely on a priori knowledge. Kant believes that using a posteriori knowledge or experience as the basis of any idea undermines the idea and therefore renders the idea invalid. Kant’s philosophy that rationalism is the key to understanding is not necessarily correct in the real world though. Rather, experience is an essential part to understanding in the real world and, in some cases; experience is the only way to really know something. While Kant believes that using any a posteriori proof cripples his argument, his use of pure rationalism causes his ethical system to be unrealistic, and seemingly impossible to achieve in the real world. In writing his paper about the categorical imperative, Kant forgets about the validity of experi