Translation of "rationalist" into German

He was a great rationalist, humanist and scientist all throughout his life.

Sein ganzes Leben hindurch wirkte er als ein großer Rationalist, Humanist und Wissenschaftler.

One of the arguments made was that Kant's theory was a rationalist one from the start, as opposed to sentimental as is usually portrayed.

Eines der angebrachten Argumente war, dass Kants Theorie von Anfang an rationalistisch war, und nicht sentimentalisch, wie sie oft dargestellt wird.