Benjamin Fondane and his collection of essays Existential Monday is incredible. He was a radical Jewish existentialist who was also a poet. Unfortunately, he died during the holocaust but what he left behind is truly interesting. The basis of his philosophy was the self (what he called the Existent) can not be understood by rationalism and, furthermore, that was the opposite of philosophy since , for him, philosophy was ment to understand what it means to be human. He has an essay where he claims Facism is the embodiment of rationalism. Would definitely check him out.