It is their version of the categorical imperative that the 18th-century German philosopher Immanuel Kant identified in morality.

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He was also heavily influenced by the German philosopher Ernst Bloch and by the student movement of the nineteen-sixties.

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In 1844, the German philosopher and poet Friedrich Nietzsche was born.

CNN: Tuesday,

He was a German philosopher.

CENTERFORSECURITYPOLICY: Center For Security Policy