Kant's ''very love of exactitude and his scruples about knowledge, misled by the psychological fallacy that nothing can be an object of knowledge except some idea in the mind, led him in the end to subjectivism; while his rigid conscience, left standing in that unnatural void, led him to attribute absoluteness to what he called the categorical imperative. But this void outside and this absolute oracle within are germs of egotism, and germs of the most virulent species''.

Santayana